If nothing else, a few dozen from the bait shop will make many more so long as you have the structures in the pond for them to lay eggs on. Just ID them very well before putting them in.

As far as crawdads go...don't put them in until you have the game fish established. I put too many craws in my pond at the same time as the FHM's and gave them a year to do there thing. It worked great for the FHM's, but the craws multiplied ALOT and grew out in front of my stocked fish. They got so numerous and large that nothing could control them. I now have a muddy pond filled with craws. Don't get me wrong, I enjoy trapping them, eating them, and giving them away, but I wish I waited until the game fish were stocked and grew large enough to feed on them. All it takes to seed a pond with craws is a dozen or two that are berried (carrying eggs) put in during the spring and some rocky patches for cover.

Fish on!,
Noel