It depends on the sp. They will often ask for age, race, occupation , full name and contact info. Some also ask for board handles and references.
I don't usually ask for this info. I trust my own instincts, and often in the few instances that I have ignored them it hasn't gone that well. If I have my doubts then I shouldn't proceed.
I always ask for a phone call for first time visitors because that way I can tell if this person is for me or not.
SD