Choosing a Location
Choose a sunny location. Use mildly rich soil with a little compost added. I used topsoil straight from the garden, then added a few shovels of compost. Rice likes nutrient-rich soil, but is not an exceptionally heavy feeder. I would think that any soil that supports wheat or lawn grass, will also support rice. It prefers a soil pH of 5.0 to 6.5. So, in most locations, you can add compost liberally, without worrying about "overfeeding".
Depending on your annual rainfall, you can transplant the seedlings directly into the garden soil or into a paddy. The direct method requires no artificial containers and it is easier if you receive enough rain. Rice doesn't like cold water, so a garden hose is a poor substitute for rainwater. If you must water your garden planted rice, try finding a warm water source, like the faucet of a laundry sink.
For the strongest, most prolific stalks, I recommend a container with a closed bottom. We used plastic containers and a child's wading pool. I would like to try some large, galvanized containers; like the ones that farmers use to water their livestock.
Fill the containers at least 6" deep with soil. Rice has prolific roots. Mix the soil in the containers, to even the distribution and remove any large air pockets.