That's a tall order !! There are many things that will help but just remember that when dealing with furniture,,nothing is cut and dried,,,yes or no !! There will be a lot of maybe`s !! I have a few sites that will help you as far as style and what to look for !! Best thing is to post your pics here and then ask questions !! Start small with one style and read what you can about it, look at google images and see all the variations and again ask questions before you try to take them in all at once !!~ And remember that even though one style was 19th century,, there will always be the revival styles that are 20th century !! Let me look and see whats on my desktop !! Should keep you busy a while !!