Disclaimer: I'm in an RN program... but the beginning stuff should be pretty similar.
First off, you need to start gathering your certificates (like CPR) and your immunizations together. Expect that they may require a 2-step PPD test instead of a 1-step unless you can prove that you've got a couple years of negative results. Doing med math is actually pretty easy, once you get used to looking for the right things and just plugging them into the right formula. Any good med math book should have many examples of med math for you to do.
As to books, background check, and the like, expect that they'll have specific info for you at the informational meeting. Especially for the background check, they'll want to use a service that you probably fill out some stuff, upload your info (and probably your immunizations), and your certs to. It will probably be a specific service and they'll give you the exact instructions for you to use to get things going so that they can review all the results.
They may have you purchase malpractice insurance
, and it'll probably be through a school selected vendor, so expect there'll be a fee for that somewhere along the line.
For a lot of what you'll need to do, just wait for the meeting as they'll spell out exactly what they want you to do. Consider that this is essentially the beginning of school. Failure to follow the directions and get things done on a timeline they want will result in problems for you down the line.
Congratulations on getting accepted to school! It's going to be a long but interesting program.