You can source forage on your own or with the help of this forum. Others in your state can give recommendations. Local bodies of water may have a rich supply of 'baitfish' and crayfish which can be good forage sources.

If you read here you will read lots of warnings about sorting anything from a fish farm or fish truck to be sure you aren't getting unwanted hitchhikers with any fish that you purchase from them. In a small pond a few unwanted bluegill or LMB and you will be soon wishing you had hand sorted before stocking.

LMB and crappie represent a population management problem. They will take over any body of water unless there is a good balance of predator and prey.

Catfish may be OK if you are OK with a very muddy pond at all times and if you can put in very very few and take measures to prevent any reproduction. We call that 'put and take'. A few catfish for pellet feeding and fun catching and eating is OK but there are trade offs.

usually in small ponds you want panfish that don't reproduce or reproduce slowly or else you face the predator/prey balance act. In a small pond with limited capacity to carry fish (fighting over available food, space, oxygen) that balance act gets even more difficult.

One spawn of LMB or one spawn of BG and you are already out of balance.