Ok, I appreciate it, but I also need to find out about grants.  I do not understand why the grant works in such a manner that I can't buy my books yet.
Usually the school first applies your grant money toward your tuition, fees, and room and board. Money left over is paid to you directly for other education expenses like the books you need.
about identifying your service provider, how do I find out who my loan manager is?
very easy call the FSAIC Federal Student Aid Information Center at 1 - 800 - 433 - 3243.