Not to be the guy to kick your puppy, but if that plant is 3 months old, and only that big, I dont know if I would bother flowering it. If you dont have access to other clones or genes, you might as well flower it, but I wouldnt bother cloning it.
you might try repotting it to assist a growth spurt in flowering and prevent the plant from becoming root bound.

hope this was helpful...