Unlock Jermaine Dupri 
Create a player with "SOSODEF" as his last name, and message will appear saying that you've unlocked him. 

Free Agents for Draft Picks 
After your first season of a dynasty and after the first offseason, the premium free agents will still be available. Sign them for 1 year minimum and then trade them for a first round draft choice. 

Unlock Lil Flip
To unlock lil flip go to create a player. Then as the last name of the player put flipper.