STUDENT GUIDE TO TUDOR HISTORY
The point is, while there is a lot of information on the web your best resource is still going to be books. Although there is a lot of good information about 16th century England on the web, and many websites can be found in the links section of this site, ultimately the web is not a substitute for your library.
If you are still having trouble after you've read through these pointers, you can submit a question to the Question and Answer Blog.
If you can't find the books you are looking for at your school library, try a city library or even a local university (most likely you'll have to read the books there, but you may be able to arrange to get someone to check the books out for you). If none of these sources work out, try an Interlibrary Loan Service. Ask your librarian for more information.
Finally, here is some great advice from the Richard III Society website:
Good luck with your research, and I hope that you are inspired to learn more about Tudor History even past when your assignment is due!