Creating a comprehensive outline of your thoughts is the best thing to do when you start to write after you think of a good thesis or idea. Then going to a fellow classmate or professor who has also read Suetonius as well is a next good step for drafting a paper. After you have talked about your paper, your thesis, and refined your ideas, the next best thing to do is to just write a rough draft. Obviously this is a lengthy writing process but you will create a better paper. Additionally, this will give you more time to do the most important part of the writing process, editing and revising your paper.

A good editing job where you spell words correctly, have correct tenses in sentences, and correct and check the meaning of words will make a stronger paper. Then with good revision of sentence structure and ordering of your paragraphs with your strongest idea first after your introduction and your weakest idea before the conclusion will make a stronger and clearer argument. It is really important to remember this because it is hard to write a good paper the first time (even if you are a history graduate student like myself).

However, you should know this is an ideal model for writing a paper that is hard to do unless you have time to invest (something that is hard to do especially if you work a job). But I would suggest reading or skimming the couple books I will recommend and use the index to look up key terms you want to write about. Also using the bibliography to look up other sources would be another good method to complete this research paper and refine your ideas. These methods will help you write a better paper faster, if you need to do that.

As for suggested readings, the two books I would suggest you read are Ancient Rome: A Military and Political History by Christopher Mackay and either of these two books:

The Annals of Tacitus if you decided to write about the Julio Claudian Emperors

Or

The Histories of Tacitus if you decide to write about the Flavian Dynasty Emperors or Domitian

The Mackay book will give you a very good, crisp and short summary of what happened in ancient Rome. It is a great book to get some good data in a short amount of time (something I can contest as an ancient history graduate student that reads this stuff for fun). And the Tacitus reading will be valuable to you because he is writing about the same things as Suetonius. This is as much as I can help you for now but this reading will help you come up with a good idea of what you want to write about. Comment back with ideas and a thesis if you want and I will gladly help you more if you like.