Marlene, the others are correct that you might be able to handle all of some of the construction. But BEG is definately right on with his advise. If you start this out as a total do-it-yourself project, this is a sure road to disaster. You could easily end up doing the project three times over, once your way, once tearing all your work down, and once doing it or having it done the right way.
One thing that you might consider if you have a college near you that teaches architecture or structural engineering is checking with the office there to see if they have a student that is far enough along in school to adequately design and draw the project. This is not to take away any business from BEG or other professionals. I would be surprised if you could get many to look at it for the dollars involved.
Another thing to consider is tools for your project. While you might be able to round up a hammer and an electric drill and saw, you might spend more for the tools to do masonry than a pro would charge for doing the work.