Put them in 6in. pots when they have 2 sets of leaves when they have 6 sets of leaves put them in 14 or 26 in. pots they will be fine in those pots until harvest. Miracle-Gro planting soil with about 1/8th perilite and 1/8 sand will be good feed Miracle-gro every two weeks 1/2 mixture sit back...
Maybe you should just plant the comlpete stalk all the way to the first set of leaves as the stalk will root and give a great root ball. Last year I did that and my plants were almost 8Ft. tall and 4 ft. across each plant gave me around 12 to 14 oz,s Good luck, Yotonka