After 3 years
4
First off, you have to be an incredible football player. Then you have to play college football for a few years, then you enter the NFL draft, and hope you get drafted.
Basically 3 years out of high school you are eligible for the nfl draft or if you red shirted your freshman year, you can can leave as a sophomore.
Illinois
They're not selected, they declare if they want to go or not after at least two years of college.
There are no specific classes required to play for the NFL. They typically draft out of the College football system, so typically expect their players to have completed 2 or more years of college, some as many as 5 years of college.
The NFL has a 7 round draft. However recruiting does happen with players who are undrafted.
You can enter the NFL Draft with three years of college education. Many football players will redshirt as a freshman which is the NCAA legal way of giving a student five eligible years of football at college. You may see people enter the draft as a sophomore, however the redshirted so it is actually their 3rd year in college.
USC
you draft them
Either be drafted out of college in the NFL Draft held in late April or be offered a tryout by an NFL team