How do I create my own recipe?
Creating recipes of your own is not too difficult. Many brewers start with making kits, then move on to brewing recipes from any of the many brewing books that we stock. From here, making the jump to formulating recipes of your own is not far. Really, it's just grains and/or malt extract, hops and yeast.
As long as you combine those things, you'll get beer. Whether or not it adheres to a particular style guideline is up to you. Many books even have a section that tells you which ingredients are preferred for each individual style. Get creative!