Do you have any idea what cultivar you have. In any event you will need to
transplant your healthiest seedlings to larger pots. How large depends on
whether you have a miniature plant, a small plant (The cultivar "Patio" for
example), a medium plant like "Celebrity" or a full size plant. The small
category are prolific bearers for the size of the plant, so if your current
tomatoes don't pan out look to the small type cultivars next, They are very
good for containers.