Each county has their own regulations on building. Check with the department where you would get a building permit and ask them. If you go in, they will probably have a printout as well with the different regulations that you would have to follow.
As far as 'How-to's', Google it. They have places where you can order blueprints and there are also places that have them free. One I use is http://www.countryplans.com/ They have a wide variety and good how-to's. Free plans and plans to pay for. Find what you want.
Good luck and have fun.