CB Radio Newbie question, on/off road communications.

I have just bought a Midland CB radio for on/off road communication use (and emergency use). Can someone tell me which channels are used for what communications? I know about channel 9, but I'm confused as to how you use the rest. Do I go to one channel first or just keep scanning until I find someone in my area? Then do you have to move to another channel to talk? Help please.