Start small. An inexperienced gardener putting in a huge garden is a recipe for being overwhelmed, and giving up entirely in frustration.
Plant what you like. Are fresh, real tomatoes the best? Do you hate the pink crunchy things they pass off as tomatoes at the grocery? Plant 2 or 3 tomato plants.
Maybe a couple peppers.
Do you cook? Try a few herbs - thyme, oregano, both easy, and perennial (will come back year after year of their own accord).
Add more plants as you gain experience an confidence.