When I talk with someone new such as you are, and they are interested in some sort of activity. I generally ask them to help me understand their interests more by completing a checklist (google BDSM checklist). If they really don't have any idea what they want, just know they want to explore. Starting things off with bondage, or a spanking is a good way to judge if they are going to enjoy pain or bondage more, or perhaps both. Then working in a scale of intensity over time (usually months, to years) to see where their interests are headed.

As stated before. Don't take the first Dom to come along.