I've been putting in food plots of various sizes for a long time, so hopefully we can get you started on a good one.
I guess the first question is do you want a food plot to attract deer, or do you want food plots that remain year after year to provide protein for antler growth and a healthy herd.
Is this your land, or a lease, and what part of the State is it in? Has the land been farmed previously, or are you breaking ground for a new plot?
The first thing you have to do, no matter what is to make sure the soil is healthy. Take a soil sample from a dozen places around the area where the food plot will be at root depth. You'll have to take a shovel and a 5 gallon bucket. Dig down about 6" put a small sample in the bucket and at the end of the day, mix it throughly. Any of your local Farmers COOPS can supply sample bags for about $10. They are sent to Oklahoma State University, for analysis.
Here is where your decision about planting comes in. You have to tell them what your planting, and they will give recomendations for the amount of lime, fertilizer, etc that the soil needs to produce the crop. Clover crops that last year after year will require one thing, and if you want to plant some of the other annual food plot seeds they will require different ammendments to the soil.
Sounds complicated, but its not. I'm just covering all bases.
At this time, just need to know what type of plot you want to put in, and what your interested in planting.