Most guys who have two ponds like to use different fish communities that are not capable of all living together, but when separated into two different ponds do well. An example, RES, SMB and YP in one pond. BG, RES, LMB and CC in another...
Since you already have your first pond stocked, you may consider using your new pond to grow forage to supplementally stock into your larger pond. Say, stock your 2/3 acre pond with GSH, FHM and BG. Seine it a few times a year always leaving a few fish behind to repopulate. Just a few ideas, I am far from an expert though... Perhaps other can weigh in with their ideas.
