Where can I to lean how to do tattoo's?

Create a portfolio of some of your own tattoo sketches. Anything from portrait to traditional to tribal (yuck!). Make a neat portfolio of a LOAD of sketches that could be used as tattoo stencils and take the portfolio to a load of different tattoo shops. Ask them if they would take you on as an apprentice. That's your best bet :) Oh - you need the portfolio of your OWN sketches because the tattoo artist will want to see the quality of your drawings and how good of an artist you are before they take you on. Good luck!

Well as far as I know there are no "tattoo schools". The best thing to do would just be go to local respectable tattoo shops and find someone who is willing to talk to you about getting into the business of being a tattoo artist. The shop may have room for an intern or know somewhere which does. And yes they do practice on pig skin (fresh from a butcher, its like human skin). Also you'd have to practice on yourself a little.

the best thing to practise on is pig skin

Build you a raft like on huckleberry finn and drift out in the water and think about it.

I'd say enhance your artistic abilities. Get a tattoo gun, practice on pig skin. Go to a tattoo parlor, and ask them what they did to become tattoo artists. :)