For pitching, 1/16oz to 3/16oz work best in most situations. The occasional windy day, or deeper water current break, you might have to go up to a a 3/8oz.
Vertical jigging, 1/4oz 5/16oz and 3/8oz will do the trick.
I would begin by getting all jig sizes up to 3/8oz to cover all situations and stick with 4 colors to start, unless you are really looking to stock up 
Best 4 colors in my opinion are black, orange/chartreuse, sour apple and plain lead.
I tie my own hair jigs with the precision heads as well. They work great for hair. I just clip off the wire keeper and tie away.