Bubba you do not have to stock Catfish...they are just a novilty fish only.
for Crappie stock your pond "Bass" Heavy and try to astablish a threadfin shad forage base. Of course have you Blue Gill and redear population strong.
After your Bass and bluegill have been astablished for a good solid year. Stock about 50 Adult Black crappie.....Remeber fish ALL you can on these Crappie and KEEP ALL YOU catch!!! Harvest some on the BASS and very littel on the Bream.
You are going to want to keep a close eye on your shad population, make sure it is strong..