Basicly, I would recommend hitting up a couple book stores, and take a look at thier plan books. That will give you a basic idea to start with. To have a plan drafted can be $$$$$, but you could try it yourself. I draw all my own plans, pretty basic though, I dont know everything. I would tell you to talk to my brother, but he no longer has CAD at his work. Hopefully someone here can draw up somthing for you. But basicly, get the basic Idea down, and then have someone draw it up for you.