Most of all you should think what exactly you would like to tattoo on your body. That is the most important decision to make. You should sketch your tattoo design to see what it would look like. And if you can not draw well, you could ask someone else to do it for you. You need this sketch, because by showing it to your tattooist, he will form a clear view of the tattoo you want.
It is really important not to drink coffee and alcohol a few days before the making of the tattoo!
It is a fact that these drinks widen the blood vessels and if you have drunk coffee or alcohol, your skin will bleed a lot during the tattooing. It might cause ink blurring. That would be really unpleasant for the work of the specialist.
You should gather some information of what a tattoo might cause to your skin and health. You must consult your doctor before you make any decisions. It is better to do that now in order to avoid any complications. If you are under the age of 16, you need to have your parent`s approval. Otherwise no one would risk tattooing your body, because it will be illegal.