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Winnebago's site has a number of wiring diagrams posted. They're a great example to use as a starting point and include most typical electrical components. The URL is
http://www.winnebagoind.com/diagram/Wiring.htm
As an electrician myself, I would suggest making a list of the components you want in your motor home. Then just find any old local electrician.
DC wiring is very simple and almost fun for a pro.
But for a novice.....it could prove to be difficult as well as a fire hazard. In fact don’t be afraid to ask your electrician for suggestions. You may find he has a number of good ideas for you such as roof top solar trickle charging. Good luck, have fun and send us pictures when your done.