How much are you looking to spend to get started? Do you have a client base already? Perhaps learning a bit more about the industry and then doing a few outsource projects to "get your feet wet" would help. But if you are serious about it, go to a few manufacturers websites, hit up a few of your local sign shops and just ask a few questions. I work for a company that is now publicly traded which was started by a guy in 1985. With no experience he bought a repro company, then another, then another...and so on. Today, if you got something that needs printing, no matter what. One of our 300+ locations can do it. So don't listen to people who tell you that you can't. You'll find forums whether about signs, cars or bean counting always have those few people who are quick to judge, give a smart-ass comment and think they know more than you do...