I know what you're thinking. You want to get a "sweet tribal tatty" right? Wrong. Unless you go in and say I want a maori tattoo, or you bring in references and history and meaning about the tribe a certain design means, you are getting blackwork. Here's a quick how to guide.
Go into a tattoo shop, talk to the artists. Don't pick something off the wall, or the internet, most likely someone already has that. Ask them to draw something for you, or better yet, draw something on you. A good artist that knows about muscles and how they move in your body can generally draw you one that will fit your specific body.