You will definately want good populations of bass and bluegill before you even think about stocking some crappie. Give the bass and bluegill at least a few years to develop and then maybe transplant a few crappie.

Here is a lot of good info from the AGFC about pond stocking. You can also call 'em up and they will give you all the help you need. http://www.agfc.com/fishing/fish-man...anagement.aspx