Would anyone be able to reference a few things to read regarding preparation for 15R AIT?

Here is a thread that may help, also some people you can reach out to: https://www.rallypoint.com/answers/anybody-have-any-information-on-15r-duty-stations-deployments-the-daily-etc

There is really nothing to prepare for AIT for 15R just show up with a good attitude and willing to learn and you’ll suceed

try googling: Army, 16R Ait. I did very informative.