If u started a season then most likely other teams signed them to their teams...that's why not in FA Pool.
But if u didn't they will be in the FA pool section.
I don't know what u doing wrong...are u making sure u have this roster loaded before u going into cfm and also are u choosing custom roster and not pre season... If u choose pre season NONE of rookies will be in cfm because that roster dosent have them on it.