Plant your tomatoes in an area of the garden where they will receive at least eight, and no more than 10, hours of sun on an average day.
Use tomato cages to ensure you get the largest crop possible. Like staking, tomato cages keep your plants off the ground, ensuring that the fruit doesn't rot. Rotted fruit is a sure way to get paltry final production. Buy pre-fabricated tomato cages, and place them around each plant to assist its growth. Leave about three feet between plants if you use tomato cages. This ensures ventilation and drainage remain optimal.
Fertilize your tomatoes every week with a half-strength dose of a complete fertilizer. Don't add more fertilizer than this. Don't use a nitrogen-heavy fertilizer, or the plants will grow too much greenery and not enough fruit.
Lay a thick layer of black plastic mulch material around the plants.
Water your tomatoes regularly. When you water the plants, do so in the morning, and only water the soil around the plant. Don't let water splash up and land on the stems and leaves.