There's no drill. You walk in, choose the attendant you wanna see, pay the door fee, go into the room, take a shower, lie down buck naked on the table or keep your towel on until the attendant arrives, decide what session you want (topless, nude, NR, BS), spend the rest of the hour being pleasured in erotic ways, take a shower again, pay the attendant, and leave. Easy as that !!!
You are not expected to tip, but if you feel that the attendant went out of her way to please you, then go ahead. In the end, it's up to you.
For me, a visit to an MP is usually worth the money. However, going to an incall is a totally different experience than going for a massage. Try an MP out once to judge for yourself if you got your money's worth.