My dad always had on when we were growing up, decided to make one last year. It was a small one, but it done pretty well. We done best on tomatoes and cucumbers. We planted about 10 cucumber plants and picked over 400 off of them. And about 15 tomatoe plants and picked over 200.
Fertilize it well before you plant but don't over do it, it will burn the plants. And we used ALOT of miracle grow.(the powder one that you put in the water hose attatchment) We mirale grow'd every couple days unless it rained.
Check out this site, it may help you.
http://www.almanac.com/garden/