First and foremost.... buy some good seeds. Look for some heavy yielding outdoor strains that are easy to grow. I suggest you grow at least 6 plants.
Find a good growing location. A good growing location must have decent soil. (avoid soil with too much clay) Check the PH level of the soil if you are planning to grow the plants directly in the ground. If soil is above 7, or below 6, you will have to correct the ph. Ideally, you want to aim for a ph level of 6.5. Once you know the soil is good to grow in, you should mix some organic matter into the soil. (Such as worm castings, compost, etc.)
Another option is to dig a huge hole in the ground, and fill it with some good potting soil. This would probably be the easiest way to go for your first grow. 5 feet in diameter, and about 3-4 feet deep. Give all your plants around 6-7 square feet of spacing. Growing them to close together can cause problems.
Also, its extremely important that your grow location gets plenty of sunlight. The more sunlight, the better.
*take precaution when choosing your grow site. Animals such as deer can fuck everything up in one night.*
Here is some basic info... good luck. Don't set your expectations to high. Everyone's first grow was far from perfect...