Step 1 - go to Home Depot and spend a lot of money. [Insert joke from Old School here.]
Step 2 - have a hot husband who worked at a nursery in high school. This step is optional, but makes it more fun (and probably more successful).
Step 3 - Play in the dirt.
Step 4 - Water and enjoy the herbs, flowers and fruits (yes, tomatoes are fruits) of your labor (in about 70 days for the tomatoes).