While much more can always be said, the following is a copy & paste from my answer posted before in the similar thread, What are the best books available on the Thirty Years War?

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Peter H. Wilson, The Thirty Years War: Europe’s Tragedy, Cambridge, MA: Harvard UP, 2011 is the standard book on the Thirty Years War in English, though the tremendous pages of the book is certainly intimidating to beginners.

On the other hand, there are certainly some contemporary accounts from a view of civilian or a low-rank soldier (mercenary) during the war, and their translation will be found in a few collection of primary texts. The following is a copy & paste from my brief answer to the previous post, titled as I have heard that many first-hand memoir and diary accounts of life during the thirty years war exist, are any available in English or only in their native languages and if so is it possible for a layperson to obtain access to these materials?

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Helfferich, Tryntje (ed. & trans.), The Thirty Years War: A Documentary History, Indianapolis: Hackett, 2009: includes two of such memoirs, that of Soldier Peter Hagendorf and of Civilian Hans Heberle respectively, in English translation, though I'd also recommend also to read English translation of Grimmelshausen's Simplicius Simplicissimus (1668) (linked to Penguin Classic English edition) to grasp the atmosphere of the 17th century after within the end of the thirty tears war.

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(Added): I admit that I haven't caught up the trend well (and I haven't read the work by myself), the approach to the Thirty Years War from a gender point of view has also recently got popular.

Ailes, Mary E. Courage and Grief: Women and Sweden's Thirty Years' War. Lincoln: University of Nebraska Press, 2017: probably represents this trend of research the best.

So, you've asked about quite a few different things here. As I'm sure you know, the Reformation is generally held to have begun around 1517, the Eighty Years' War in 1568, and the Thirty Years' War in 1648. This spans much of what is generally called the early modern period, and so it seems you might be interested in the broader strokes. I'll provide a brief list on each topic you bring up - though /u/y_sengaku's answer has already provided you some great recommendations!

The Early Modern Period, 1500-1800

• The European Dynastic States, 1494-1660, Richard Bonney, 1991. This is a thorough and influential look on how states coalesced in Europe. It's quite long but very general, providing both a narrative history of Europe throughout the period and then a large interpretative section covering everything from disease to urbanization. If you're interested in the period broadly, this is a great place to start.
• The European World 1500-1800: An Introduction to European History, ed. Beat Kümin, 2018. A solid collection of essays giving differing perspectives on the major aspects of early modern European history. It's explicitly aimed at the undergraduate level, and is a nice length.
• Europe Divided, 1559-1598, John H. Elliott, 2nd edn. 2000. This will probably have most focus on the Eighty Years' War (the area on which I'm personally weakest) out of anything here, and is a well-known, well-respected synthesis of this area.
• Early Modern Europe, 1450-1789, Merry E. Wisener-Hanks, 2nd edn. 2013, 3rd edn. coming out this year. Again explicitly aimed at the undergraduate level, this is a good synthesis of different topics in early modern European history, and very up-to-date with current trends in the historiography (especially with the 3rd edition coming out this year).

The Reformation (with a focus on Germany)

• The Early Reformation in Europe, ed. Andrew Pettegree, 2008. A nice collection of synthetic essays overviewing the Reformation in Europe by different countries, including some less-studied cases such as Hungary. Probably the main weakness is that, weirdly, it doesn't have a specific chapter on Germany or the Holy Roman Empire, though it does have chapters on Switzerland and Austria/Bohemia/Moravia.
• German Histories in the Age of Reformations, 1400-1650, Thomas A. Brady, Jr., 2009. A dedicated history of the Holy Roman Empire during the early modern period with a strong focus on religion and politics and the ways in which they interfaced. A strong general text for this period and area.
• Europe in the Sixteenth Century, Andrew Pettegree, 2011. Short and aimed at an audience unacquainted with the period, this is again aimed at a general synthesis of the 16th century. It has a good religious focus.
• Reformation Europe, 1517-1559, G. R. Elton, 2009. Venerable but still very good, this will also get you off to a solid start on the period and its religious problems - though its academic style is not super up-to-date.

The Eighty Years' War

• Revolt in the Netherlands: The Eighty Years' War, 1568-1648, Anton van der Lem, 2011. A good history and interpretation of the Eighty Years' War, though as I said above I'm not the best judge of things in this field.
• The Dutch Republic: Its Rise, Greatness, and Fall, 1477-1806, Jonathan Israel, 1996. This is the "must-read" book on the early modern Netherlands, and it treats pretty extensively with the Eighty Years' War throughout. Be warned it's quite controversial historiographically, though.

The Thirty Years' War

• The Thirty Years' War: Europe's Tragedy, Peter H. Wilson, 2011. As /u/y_sengaku said, this is pretty much the current standard work in English, though it is also quite long. Wilson is an excellent historian, so I'd definitely recommend this eventually!
• The Thirty Years' War, ed. Geoffrey Parker, 2nd edn. 1997. Probably the only other work that can claim to be an English-language "standard" for the historiography of the Thirty Years' War, though on a much smaller scale. It collects some essays from other scholars for differing perspectives, though Parker wrote most of it himself. It's also quite short and manageable.
• The Thirty Years War: A Documentary History, ed. and trans. Tryntje Helfferich, 2009. As has already been said, this is a really good collection of primary documents in translation, from treaties to broadsheets. It's combined with a nice selection of interpretative essays to keep you aware of the broader picture.
• The Thirty Years' War and the Conflict for European Hegemony 1600-1660, Sigfrid H. Steinberg, 1966. A more risky read, since it's old and outdated on quite a few fronts, but it is effectively the fount of what is still quite an influential interpretation of the Thirty Years' War, that it was merely part of a broader conflict between the Bourbons and the Habsburgs. Short, but not to be read until you have some more modern stuff under your belt.
• The Thirty Years War: A Sourcebook, ed. and trans. Peter H. Wilson, 2010. Similar to the Helfferich volume, this collects, translates, and comments on a number of primary sources relating to the war. There is some overlap, but you can either choose between these or fruitfully read both. This is probably more comprehensive/wide-ranging, but it generally has shorter extracts.
• Experiencing the Thirty Years War: A Brief History with Documents, eds. Hans Medick & Benjamin Marschke, 2013. A similar collection of interpretation and documents as the Wilson and Helfferich volumes, though with a much more civilian focus and more interpretation.

As you can see, historians of the Thirty Years' War are super inventive with their book titles...!

And as an extra on the end, a book which deals with both the Eighty and Thirty Years' Wars pretty extensively, plus other stuff:

• The Military Revolution: Military Innovation and the Rise of the West, 1500-1800, Geoffrey Parker, 2nd edn. 1996. The book that set the agenda on early modern military history, covering lots of themes and with a healthy focus on both of the conflicts you mention. Incredibly influential, if not without critics.