The first thing you need to do is to find a sturdy outdoor planter that will be able to withstand the weight of the dirt and plants. You can use any container so long as it has drainage holes. The container should be at least 12 inches deep, but deeper containers are better because they allow for more root space.
The next step is to fill your container with potting soil. Fill it up until there is about an inch of dirt on top of the drainage holes. Then, plant your seeds or seedlings in the soil and water them well.