if they are not in flower, they are in veg. you need to wait about 2 months from germination (planting the seeds) until you switch to 12/12 light. make sure you lightproof the room in which it flowers. get a fan and DO NOT blow it directly on the plants. if you can, go to a local nursery and thy carry all kinds of nutes. when asking, tell them you are growing tomatoes. tomatoes and pot grow identically. id find something with a grow and a bloom. get a micro if they offer it but youll be fine if not. use the drain to waste feeding chart. cut that shit way down. 25-30% strength, you dont want to over fert them. its easy to do. use bottled water or RO water. tap water has chlorine. make it for a gallon at a time and shake the hell out of it. water them about every 3 days or so. wait til the topsoil in your pot(<-- hahaha) is dry and crusty. you dont want get root rot. so water one day, skip 2 days and water the 3rd. make sure you buy bulbs that are a usable spectrum (6500K-veg 2700k-flower)