It really depends on your needs for the nucs and when in the year you do it. I have started nucs with 1 frame of bees, 1 of honey, queen, and lots of feed. But that was just to house queens for a while if needed. 2 or 3 frames of bees will build up much faster. If you want more hives and some honey, put 4 frames of bees in a hive with drawn frames in the spring. But most anything will work.