We did a discussion on this earlier in the year and the archives for that is available through either my site at vidette's submission or CrimsonLord's site Don't arrange to play the very first time you meet someone. Don't rush and don't be rushed. Communication is so vitally important in these early stages. Communication is a reciprocal thing remember. You need to take away what you have been told and weigh it up.
Collars are always a contentious issue.
It's not something that you should consider lightly. Think about what your attitude to a collar is. They are completely subjective. This is what you need to clarify in your own mind to help you make the right choices and right decisions. There is a significant amount of information available online regarding collars.