How can I find floor plans for an extra room on the back side of my house?

Question:14X16. Door to outside on end of room, double french doors for entrance, two slider windows or one large window on each side.

Answers:
I did something similar. I hired a draftsman/architect to create the necessary plans for the building contractor. I don't remember how much it cost off hand. However, it was a simple project and he was an independent as opposed to an employee of a larger company so he gave me a pretty darned good deal.