A few things to start. There are two broad types of tomato plants, determinate and indeterminate. Determinant tomatoes grow to a certain size and then stop growing. Indeterminate tomatoes will grow continuously throughout the season (FR FR no cap). Determinant tomatoes generally should not be pruned. I select indeterminate varieties because I want to maximize production.The downside to this is they get massive. If you’re low on space, they can easily overrun other plants and crush weak support structures. We don’t play that weak tomato game out here. If you’re wanting to bump your rookie numbers, try out the following with your indeterminates:
Prune lower leaves and allow the wound to heal: Below you will see a close up of my current tomato plants. Several weeks ago they were potted up into 2”x2” pots with a potting mix and dusting of organic fertilizer. They have doubled in size, I’ve rotated them outside to harden them off (acclimate them to the sun and outdoor temp shifts), and they are ALMOST ready to go in the ground. The last thing I do before I plant is prune the lower leaves. This allows me to plant the tomatoes several inches deeper in their permanent home. In red you can see several places where I have clipped leaves. The wounds will scab over in a few days. In green you can see the hairlike fibers above the soil line. These, if planted below the soil line, will become roots. In their current pots, these plants have about 2.5” of root system below the ground. Trimming the lower shoots and planting deep will effectively double the area of the root system. Since these plants will grow continuously through the season, it's a small setback that will pay serious dividends later on.