Unless you are running FB/Press, then all2matt's suggestion is the right way to go. Only target 3 or 4 freshmen, then make sure to look out for some useful JuCo or X'fer players to add in. Were I you, I would probably target 3 freshmen and 1 JuCo Soph or Junior, then in period #2 try to add a x'fer or two and another freshman. Trying to fill all 10 positions is very difficult to do with any quality.