Prepare your garden. Make sure to pull all weeds, rake out all large rocks and work in nutrient rich soil and manure. Your tomatoes need a fertile place in which to grow. Also, make sure your garden gets an equal amount of sun and shade. The harsh desert sun can burn the tender skins of tomatoes so they need to be in the shade at least part of the day.
Buy tomato plants of any variety. Get them in early spring after the last frost. In Las Vegas this will be in late March; in other areas of Nevada it will be in mid- to-late April to May.
Plant the tomato plants, with several feet between each plant. They will spread out and become very large.
Prune the buds. Any of the tiny yellow flowers growing on the new plants should be pinched off. They need to take root before they try to produce fruit.
Water them every other day for about 10-15 minutes. Even though Nevada is dry it is still possible to over water your garden. Most of the soil in Nevada is clay like and doesn't drain well, therefore it holds on to water better than other soil. Also, water them with a plant booster such as Miracle Grow. It will make your tomatoes grow faster and bigger.
Protect them from the wind. Tomato plants are delicate and can be torn apart by a bad windstorm. Cover them with a clear plastic tarp and hold it down with bricks.
Harvest your tomatoes. If you plant in mid--spring you should have fruit by June or July. Be sure to harvest each tomato as it gets ripe. Check your plants every day.