If you can, try to see some of the artist's work on someone's skin. There is some skill involved in getting the ink at just the right level. Too shallow, and you'll have drop-outs in the tat; too deep, and the ink will literally migrate, causing the art to blur.
DO take your time in finding the right place, and the right artist. Have a look at the parlor, too. It should be clean, well-lit. The equipment should be clean as well. Be certain that they wear gloves and use fresh needles. Be sure that you're comfortable with the artist, too, and that he or she is willing to take the time to do the job right.
Do NOT go there drunk or on any sort of mind-altering substance. Also, it's a good idea to abstain from aspirin and ibuprofen for the 48 hours prior to getting inked (they both mess with blood chemistry). Alcohol does it, too, so you're right, you shouldn't drink before getting inked.
Afterwards, follow their directions to care for the new tattoo. Do NOT pick or scratch at it, even if it itches. Keep it covered and out of the sun for *at least* six months. Apply a good hypo-allergenic moisturizer several times a day, until it is healed.
I've posted this before, but here's my ink, which I got about ten months ago. It's about 8-9 inches from end-to-end, on the outer part of my right thigh.

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Good luck!
-Technowitch