Unfortunately, if you want to have a small practice in entertainment and sports law you need to do law school in a metro area with a ton of small boutique firms that specialize in that area. I assume business law means transactional/contract work for people in sports and entertainment. When trying to start up a small firm there are three things you need to consider 1) CLIENTS, 2) experience (can I do the work), 3) finances (how will I fund my practice while I develop 1 and 2).
1 will be next to impossible to get out of law school. It is very hard for newbie lawyers to find clients, period. It is much harder for them to find clients who pay, on time and the full amount. Especially when you are dealing with actors, musicians, etc. Sports law is a whole different animal- that's an extremely niche field that is very hard to break into unless you were a college level athlete.
2 you will probably develop if you can find a job at a smaller firm that specializes in these areas. This will be hard to do because you don't bring 1 to the table. There are so many lawyers out there willing to work for peanuts. But if you can get into a decent firm, you can develop both experience in doing the work and a sense of where there are clients who aren't being served as well as a network of lawyers to refer you clients. No law school will truly prepare you to open your own practice even just in terms of being able to do a good job on the work- this is only something that is viable with a few years of practice experience.
3 requires you to have very little debt out of law school and aggressively save. It is going to be some time, if ever, before your practice gets off the ground and until then you will be fronting the costs. It is just like starting any other small business.
Now you could go the biglaw route, which would mean you get very good experience and could probably lateral to a smaller firm after a few years. However, this will require a much better LSAT score and higher ranked school.
Right now, I would retake, reapply, and target schools in the metro areas with the greatest market for the kind of work you want to do. Find out how many lawyers work in small firms in your desired practice area (under 25 attnys) because these are the kind of people you will want to work for. If you can meet them for coffee or get advice for them that would be ideal.