Well, reading Silm and LotR appendices would help answer a lot of those questions, and if that is not enough for you, there is Unfinished Tales and all of the History of Middle Earth books(12) 25 questions is a bit much, maybe you should read some/most/or all of those books or at least the ones dealing with what you wish to write about, then if you still have questions, which you very well may have, then everyone here at the Downs would be more than happy to discuss them with you.
But for starters, I will answer a couple. 5 6 and how about 15. Sauron was never cast into the Void, so he didn't have to escape it, and Morgoth did not have a ring, at least not similar to the kinds made by Sauron and the Elves.
Balrogs is just a corrupted form of the word Valaraukar. When the Elves were sundered the Sindar went one way with the language and the others went another, or more appropriately, I guess, stuck to the originally language more closely. There were only 7 Balrogs. Originally they were Maia but were also spirits of fire, of which there is at least one other, Arien, who guides the Sun.
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