Get a basic understanding of loans at BYU OneStop.
This can help you calculate how much you can expect to pay for your loan in total, depending on how long you take to pay it off, interest rates, etc.
This explains the difference between direct subsidized loans, direct unsubsidized loans, and direct PLUS loans.
Award amounts are based on your year in school, dependency status (determined from the FAFSA), and financial need. Check here to see maximum possible amounts.
This link shows alternative lenders that other BYU students have used in the past three years.