Spiral Eel grass or straight eel grass I don't think it will matter. Your pond will limit the depth the plants can grow by the light penetration which will be limited by the amount of phytoplankton in the pond.

Bill should be able to give some advice on where to get the bait fish, he's located in Malinta, Ohio. If you don't know he's an Algal & InvertebrateTaxonomist, Aquatic Ecologist/Biologist