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Section 7 asks for Bank statements or building society savings book.
Section 10 asks for Documents proving that you can support yourselves financially. (Bank statements, building society, pay slips etc.)
You must send in 20 separate formal letters or documents in joint names proving that you have lived at the same address spread over 2 years from 5 different sources. If you don't have 20 documents in joint names you can send in 20 each in seperate names. If you are under 64 you must provide proof that you have passed the Life in the Uk test, or the equivalent ESOL citizens course.