First off, check out this thread, which has excellent advice throughout, and even covers many of the questions you have outlined:
http://www.top-law-schools.com/forums/v ... .php?t=396
2)No prep course
3)Initial diag: 165
4)Lots and lots of prep tests, Logic Games Bible
5) about a 7
6) Definitely need to balance things out, depending on how much time you have to prepare. I studied about 3 hours a day, 3 days a week to start (for about a month and a half), then with about two weeks before the test, I went to 3 hours a day each day. Nothing LSAT related (except maybe posting here) in the rest of the time.