I would suggest a hempy bucket system:
Make a hole 1-2 inch above the bottom, fill with perlite, put in a clone/seedling, and water until a little bit runs off.
Plant training: take of all the sugar leafs regulary, just let the plant branch out, hold the temps warm during the night. Top her after 2-3 nodes. And read a little about bonsai, the training is the same, but cannabis is growing faster...
Whats your goal?