Bill and Dave are right, you are doing this backwards. the last thing you want are bass with no baitfish. get some bluegill in there quickly. since you already stocked bass you will have to get some adult bluegill. you probably will not be able to get all the bass back out so stocking small bluegill will be a waste.
i have seen several ponds stocked this way. none of them had what I would consider a good balanced fish population.