Are you serious?
The breed of tomato matters a lot. Usually the ugly notted up ones like the June Pink and pink varieties look like shit but are the best for making a sandwich or eating in a salad. The ones that look like perfect pictures usually have big cores and have been bred to ride across the country on a truck and sit pretty on a display at the supermarket.
When I get transplants, if they're like 8" tall then I bury about 6" of them, as tomatos will root along any of the stalk that is in the ground. You can either dig a deep ass hole like 6" deep or you can dig a shallow trench and lay it down sideways with just the top sticking out. Either way you'll get more roots.
Mulch around then (bark, pine needles, leaves, grass clippings, hell even shredded newspaper) is huge benefit. Wont have to worry about weeds and they'll hold water longer. Dont water during the heat of the day, either right before dark or early in the morning. If you plan on keeping the same garden for a long time, stay away from wood bark and chips as mulch. They are best for shrubbery mulch. They last longer, but it takes longer for them to decompose in a garden that is going to get tilled a lot more often. Also when they decompose it robs the soil of nitrogen, which would have to be added thru extra fertilizer or poop.
Miracle Grow or those other mix with water fertilizers never hurt either. Dont have to use them all the time though, maybe half the time or less.