I live in "The Bible Belt" so when someone is interested I like to tell them their soul is not eternally damned for talking to me, blah blah.
I like to give a bit of information for new querents before we begin. A small-basic history of tarot and the limitations I use (I stray away from medical questions unless they insist, then I let them know I'm not a professional and should be seen by a professional, but a little insight couldn't hurt ^^)
I read in a quiet (except on the nights I read there, then loud jazz is playing. Go figure.) cafe that sells various teas and coffee's and very overpriced salad and sandwiches. I just sit and shuffle my cards while waiting for someone to bite. I have a Doodle-Pro (the magnetic writing board kids use) designed by my fiancee "Free tarot Readings" and a small set of pamphlets custom-designed about tarot, bit more history and what and why I read. No incense, no stones, just me, a table, my deck and my walking cane.
Due to location, I try not to mystify it any more than I can help it since these things are often the cause of un-nice words and fear. I strive 100% to give tarot readers a better name than those who would dirty and cheapen our art.
Don't be nervous, learn a couple spreads (no CC, just some simple 3,5, MAYBE 7 card spreads and go with it.)
My staple is the 3 card MultiSpread (PPF, Mind Body soul, choice A, Decision, Choice B...whatever I want them to be in the context of the question.)
5 card horseshow (Past, Present, Unexpected, near future, far future)
5 card General spread (Present, Present Desire, Unexpected, near future, outcome)
7 card horseshow (2 for past, 3 for Present, 2 for Future)
There are plenty of others written in my notebook for special questions and occasions, so those aren't the only ones. But they work for me. You need to find what will work for you and that will take you a long way.