I recommend you to start with a full back tattoo, if you are not very quick to turn around, you will not even notice that you have it.
Now seriously, I recommend you choose the first one carefully, make it something special or meaningful to you.
Discussion
There is no non toxic tattoo unfortunately, otherwise I'd get a small one at the top of me inner forearm.
Sorry, I didn't reply last night. I have a tattoo that a friend of mine did for me 10 years ago, and I know he was very careful with the inks he used. I suppose they were just the best on the market, but I'm not sure about their toxicity.
If you're not sure about it, just wait.