You might try Homepath (broken link) or
Freddie Mac: Buying and Owning a Home
I would avoid anything by the so called "mortgage professor". He's got an ax to grind and isnt real objective.
Fannie Mae and freddie Mac buy what is called "conforming loans" and therefore most of what you will want to know is in their website. Once you're educated, ask your freinds or family for a referral if they're happy with their mortgage broker. You want someone local who will attend your closing since its your first home. Good Luck!