It depends on stocking goals. How long do you plan on having them in the pond before introducing predator fish? The longer the time between stocking forage and predators the less number or pounds is required.

I would start off with 25 lbs of FHM and 25 lbs of GSH. Let them reproduce for a summer. Also stock your RES as Bill Cody stated above. I know it can be hard to wait a few years for the pond to get right but in the end, it will be more than worth. Being located in Iowa, I would probably stock in April if the temperatures (air and water) are suitable for that.