Do not stock large shiners if you don't have any predators present in the pond already... Large GSH typically have a ovarian parasite in them that causes them to be less fertile than smaller adult GSH. Fish in the 3"-4" range are prime breeders.

http://www.cheboygancoop.com/animalscience/aquaculture/fa-34.pdf

http://www.uaex.edu/pperschbacher/Fish/Golden-shiner.htm

http://srac.tamu.edu/tmppdfs/2700915-SRA...231355f244c5926

http://srac.tamu.edu/tmppdfs/2700915-121...231355f244c5926

Those links should get you off to a good start...

I think the mixing of GSH and LCS would be a good combination as they should compete very little with each other. LCS would be an excellent additional forage fish for your ponds as well. The only down side to LCS is they take at least 2 and most like 3 years to mature where they can spawn. If you got some of Overton's fish he spawned last year, they would not be ready to spawn for at least 1 more and most likely 2 more years.