Not to sure about the rules for this sub with regards to questions, I apologise of this is too vague..
Could someone give me a rough timeline breakdown of the early viking era (up to and after the reign of Alfred the Great)?
OR is there any particular website/material you would recommend to look into this period in more detail?
If you want an overview of the Viking period as a whole, I'd check out Gwyn Jones's History of the Vikings from Oxford Press. It'll give you just about everything you need for a broad overview of the period.