When creating a recruit in Dynasty make his hometown in the same state as your school. Some recruits don't care how close they are to home but the ones that do have a better chance signing with your school.
When you go into dynasty and create a recruit in the pre-season you create a junior college player (JUCO). You can then recruit him during the season. Be careful however. If you create him as a senior and you get him, you will only have him for one year.