A good rule of thumb for stocking is 1000 BG per acre, 80% CNBG and 20% RES. That's in your new ponds.
In the existing "watershed", if it were me, I think I would concentrate on pond improvements first, as Gator suggested and getting rid of the cats and minimizing the crappie before anything else. Then I would try really hard to get some quality adult CNBG. Hey, if you are willing to drive to Texas you can have some of mine.
If nothing else, find someone with them in a pond and catch some and transplant...check for healthy fish and if need be offer to pay for them. CNBG are very prolific, and with large fish you will have many small ones next spring after warm up. Honestly, in that existing pond, I would not spend money on small BG or RES. It's just a waste.
Stock your forage fish this fall in your new ponds and add LMB in June or so.
I'm jumping around and sorry for that but just spitting out thoughts...what to do about adding small LMB to existing pond? I would not do it until you have accomplished the above...pond improvements, cat removal, crappie minimization, and adult BG stocking. The only way you will get any appreciable survival of fingerling LMB in that existing pond is if there is ample other forage to choose from.
