RAH, I'd make LOTS of piles of bricks for crayfish habitat.
YP - check with your supplier as to what sized YP are available. If they can supply large sized YP (8+" or so) I'd stock 50-75 of them. The larger ones have a higher probability of being female, and there should be a few males with good genetics mixed in. Then in the Spring they'd pull off a spawn. I'd look at stocking 100-200 4"-6" RES this Fall if they are available. Then next Spring, stock 75 2"-4" SMB.
Make sure you have habitat for the YP to spawn on in the pond.
If you stocked smaller YP this Fall, I'd bet the majority of them will be males or slower growing females. Stocking small fingerling SMB at this time of the year equates to stocking slow growing fish - whether due to genetics or restricted food intake.
RES, if the larger ones aren't available, get whatever you can, because they aren't the easiest fish to source. (they aren't the hardest either.....)
You can stock more YP/RES, it all depends on your budget.
