Don't know much about 'gators so I can't say what it would take from you, fish-wise.
Warmouth probably will not sustain a LMB fishery long-term.. I believe you'll be wanting to add CNBG next spring, like 200-250 4-6" fish. They will spawn and provide the YOY it's going to take to support LMB in your area.
I think 40-50 LMB is likely twice what you'll want to start with in a 1/6 ac impoundment and I think 6-8" fish would be fine but I'd wait until fall 2020 to add them.. allow the forage base to expand with the CNBG and I believe I would cull every warmouth you catch.
Welcome aboard!