As you've already discovered, we've got an excellent group of cyclists here on our forums who are happy to help! To follow up on an earlier suggestion to get or look at maps produced by state agencies, I've got a bit more info.
Many states have online resources as well as printed materials. Nearly every state publishes a bicycle map of some sort that they will send out for free and the coordinators often have more information they can distribute for no charge as well. And while the maps aren't as detailed as ours, they generally offer suggested roads for cycling through their state often including what is called a suitability map that shows shoulder widths and traffic volumes. Here is a link to the contact information for all of the state bicycle coordinators: http://www.walkinginfo.org/assistance/contacts.cfm
Have fun where ever you decide to ride!