Hi,

copy and paste this to go to a page that specifically outlines what you should plant and how to rotate it over the years. Print it off, tack it up to a garden shed etc, and tick it off as you go.

http://www.yankeegardener.com/resource/croprotate.html

This is more complicated than it sounds as you will also need to take into account the space your vegetables take up and plant accordingly, but as you grow and harvest a plant you will get to know what its needs are. As the others say, lots of trial and error!

Good luck!