I'm assuming that if you're going to meet with him he is, in appearances, a mammal with half a brain. Good for you, BUT as CuriousNYSub says, if you can't express your nervousness to this person ask yourself if you're ready to actually meet.

BDSM stands firmly in trust and communication, even for casual play and for good reason. If you're starting down that road, he'll understand your jitters. In the case that he doesn't that should ring an alarm IMHO.

Make sure you take all the steps to guarantee that you'll come out safe and sound.
Not to criticize in any way the online meeting method, you still have to be aware that the world is full of creeps and you absolutely have to protect yourself from them.

As Denuseri always says Safety first, kinky second