I give out copies of my policies and procedures as well as my parent handbook (with info about the activities, menu, my 'ethos' sort of thing) at the first meeting.
It's never bothered me that they could be a childminder wanting to take copies, if they do then they're making work for themselves, I'd be quite happy to email them over to them to save them typing them up again if they asked straight out 
Have your contracts to hand in case they want to sign there and then, although I do suggest to prospective parents that they might want to go home and sleep on a decision rather than signing on the spot (but if everyone's happy, then there's no reason not to do it then!)
I don't give out my EY number though until they've signed a contract because they can use it to claim tax credits for childcare, as south345 says.
Have a look at this page on the NCMA site to see what sort of things they might ask you and remember to have a think about any questions that you might want to ask them: hours, shifts, particular needs of their child, what sort of behaviour management they use, things their child likes/dislikes - it's about finding out if they're a fit for you as well as if you're a fit for them
Interact with the child as well - it seems obvious but sometimes can get forgotten if parents are firing lots and lots of questions at you! :)