Headroom and lamp size determine some of this for you.
If you have 6-7 feet of headroom and a 1000 watt lamp, veg them for a while, starting in small pots and stepping up in pot size every time they become root bound until they're big and ready to flower. If you have a 400 or less and limited headroom (3-5 feet) try something like this:
Start in a small pots, 3-4 inches wide and deep, and veg them under 18-20 hrs of light until they're 8-10 inches tall. If you're using fluoros for veg (easiest, cheapest) keep them less than six inches away from the plant tops to keep the leaf sets close and the plant more compact and controllable. Once they get to 8-10 inches transplant them to 2 gallon pots and flower.
Read up on the strain and find out what others have experienced for flowering stretch. If they tend to be more of a sativa you may want to induce flowering at 4-6 inches.
Good luck and post the grow's progress if you can.