A few simple guidelines for growing tomatoes easily:
Select a sunny site for your tomato.
If you are planting in a garden, ensure your soil is well drained and friable. If planting into a pot, use a premium potting mix.
Add organic fertilizer to the soil and cultivate it through.
Unless growing a dwarf variety, tomatoes will require a stake for support. The size required, will vary depending on the tomato variety so make sure you always check the back of the label for information. Position the stake when you plant in the tomato.
Water well after planting, and then keep the soil moist, but not soaking. Water your tomato plant at the base, to avoid fungal problems.
A further application of fertilizer can be applied during the growing season.
Harvest tomatoes regularly to encourage the plant to produce more fruit.