Hope this helps you:
Hello Debbie: There are 2 types of tomato plants, determinate and indeterminate. The indeterminate grow tall and all over the place. The determinate are more on the short bushy side and are perfect for pots. They are sometimes called Patio Tomatoes. Plant them just like any other tomato. If you plant seeds, just put the seeds in the soil. If you get a plant that is already started, plant it deep, like almost up to the first bunch of leaves. That way it will grow roots out of the stem and have a nice deep root system. Good luck
Grow a small bush variety in a pot at least the size of a 5 gallon bucket. :)
Get as large a pot as you can so that it can develop a good root system. I planted a patio tomato into a twenty four inch pot and it was over six feet tall by the first frost and must have had at least fifty tomatoes mature on it. Make sure you remove the bottom dish from the pot if it comes with one, this will prevent water from standing in the bottom. Use good potting soil, I add a little peat moss to it also. Use tomato/vegetable fertilizer. Potted tomato plants lose calcium really easily because of the frequent watering in hot weather. My pots when it is in the nineties or higher require water at least twice a day or they show signs of wilting because they are too dry. To prevent blossom end rot, get a spray calcium supplement to use when the tomatoes are ready to change color or when you notice blossom end rot forming on any tomatoes (looks like a bruise on the bottom when it first starts, then spready up the tomato). This is calcium deficiency, not a problem with an infection of any kind, so the are still edible if you cut off the bad part, just ugly looking. Make sure there are enough drainage holes in the bottom of the pot, some large pots don't actually have the drain holes drilled or punched out, but there is usually marks where the holes are supposed to be. Make sure you have support for the plant as it grows taller and start forming the tomatoes as the weight can bend the branches down and even break them. Good luck growing your tomatoes and wish you great eating this summer, Debbie!