i bought 4 tomato plants, 2 green, and 2 red pepper plants. starting small... see where this takes me.
Last year--my first--I had 4 tomato plants, 4 sweet pepper plants, and 2 jap plants. This year I will have close to 50 combined with 3 variety of tomatoes, and 4 varieties of peppers. So beware. Of course, a lot depends on what you intend to do with it. My garden is a SHTF insurance policy so a lot of our stuff is grown specifically for "put away" purposes.