You might review my post in this thread for my recommendations. ... Also, review the entire thread if you haven't already. Most users on this forum will tell you to stay away from young TC plants and to buy big corms. I'm sure this is because of their failure of growing little TC and lack of growing info.
Best Practice to grow TC Bananas
Now get FlordiaHill's growing instructions. it is on their website. Without the seller's/nursery's assurance, assume the little TC plants have not been field harden. It is recommended by UofGA researchers (& so stated in their reports) that young TC plantlets be grown in the greenhouse for 12 weeks before transplanting to the field.
Good Luck