Here's a direct link to Harvard Admissions. This should help answer your questions. If you're applying as an undergrad many of the admissions requirements can be found on the common application.
Your GPA really doesnt matter, as long as its not too low- so anything above 3-3 or 3-4 should be fine. However, you will need an LSAT score that is at least the high 160s and higher.
Good Question, The main requirements to get into Harvard College are: 1. Either an on-line paper application form or a written form. 2. There is an application fee involved. 3. You need 2 teachers...