I agree with daymurphy, don't rush into it, that said i have almost a full sleeve tattoo and several other tattoos in various places and love them all and don't regret a thing. If you have a vague idea of what you might like, try simply searcing on Flickr or google images where there are loads of people's photos. You could also try looking up a few local studios on yell.com, and checking out the galleries on their websites. as Misjef has said, BME is a brilliant site for all kinds of body mod stuff, and there are dozens of tattoo fan groups on Facebook where people post their pics. WHSmiths also stock a good selection of tattoo magazines.
Hope this all helps!
Kitty. x