Speaking as someone who began getting tattoos at 16, the idea for the image of the tattoo should come first, and should be something that is special and has meaning to you. If you justt get a tattoo for the sake of getting a tattoo, you will most likely regret it in a couple of years and then it wont seem so cool anymore. I'm not trying to rain on your parade, I just think it is a bummer to end up regretting or trying to remove a tattoo.