For 2 seedlings you need 2 3-inch pots, until they outgrow them.
Read the continuous canopy sticky in the Basic section. It's got some good info on re-potting schedules.
Id sprout in dixie cups, go up to 3", then to 5", then finish in 3-4 gallon pots for 3 foot finish or 5-6 gallon pots for 4 foot finish.