When do you ship? Benning sucks pretty much every month of the year except OCT.
. Obviously you want to be in good shape, as it makes life a lot easier. 13:30 2mile, 60-70 push ups, 5 pull ups etc... But don't kill yourself on getting in shape right now, try and enjoy some hamburgers and ice-cream.
First you will go to reception at 30th AG for a week to three weeks. This is honestly the worst place on Benning and Sand Hill. It is one giant mind fuck, relax, shit get better when you get to your company (kind of).
Basic is just waking up and keeping your mouth shut. Do your best at everything, take the heat with everyone and don't draw attention to yourself. If you are looking to get in shape it is pretty easy to get all the flutter kicks, push ups, mountain climbers... you want. Remember, you can't smoke a rock.
Your ASVB score has nothing to do with your MOS, you will either be put in a class of all 11B's or 11C's. It just depends on the needs of the Army. When I went through the class ahead of us was all 11Cs, we were all 11Bs. If you are option 40 you will probably be an 11B, even if it means hanging out at 30th for another week.
Enjoy BAC, it is a nice break before you go to RASP.
RASP is hard and seems like a long time, but stay focused. When they do the initial PT test be the first one to take it. Never Quit and do what you are told. Your body can do a lot more then it thinks it can, especially if you make it. You will get through.
Good luck, Basic, BAC, RASP and on to your first deployment and Ranger School is a long pipe line, but the end is worth it. You will have the opportunity to do what few others can do.