Question about the transition.

[skinsfanthru&thru]

what about players like kurt warner? i don't remember ever hearing about him being in a draft. what if u aren't coming right out of college or haven't gone to college all together, but u want to try out for a team? i know i would personally look into the rules and options if i were a decent player in college who wanted to play for certain teams or to make sure i don't have to play for a team i hated.