If you want a tatt then you should be aware of the following :-
Make damned sure it ain't gonna be something that is likely to change, such as, girlfriend's name, paintball team, soccer club etc etc etc
Far too many idiots (me included) get carried away with whatever they are doing at the time and wanna represent their seriousness / loyalty by having a tatt only to have circumstances change somewhere down the line that ends up making you look silly.......
Any design you have is always gonna be prone to fashion, fads like tribal and Celtic will sooner or later be replaced, so you must bear this in mind also.
Do NOT have a tatt for the SAKE of having one because this inevitably means you will end up choosing one that isn't EXACTLY what you want because you have it done to service the need for having one done as against having it because you really want that design.
Tatts have evolved since I had my first one done (over 30 years ago) from a social statement into a fashion statement and so you should also bear that in mind because these are on ya for life.
And, don't just go in any tattooist, there are some guys out there who couldn't draw a pension let alone put a design on your body and so you must choose a tattooist that has been recommended to you and you have seen his work on someone as against just seeing what designs they have on their wall.
And my last piece of advice is, if you are not sure about having one, then DON'T because this lack of convictoin is invariably because you only want one for the sake of wanting one and you will inevitably regret it later.
Good luck !