If you're going full pet you'll only have 3 slots free on each bar so choose what you feel you absolutely need. Frag, a ward or 2 and curse should probably be at the top of your list. Don't gimp yourself any more than you need to. There are plenty of up to date pet builds out there, just google "sorc pet build". Not sure what stage of the game you're at but check out the necropotence set, it was made for pet sorcs.