Have you talked to him about this? Communication is really, really important with these types of things. I cannot stress that enough. If you feel he's moving too fast or doing things you don't like, you need to say something.

I don't know what fetishes/kinks he has, but most everything has different levels. So if he's into whipping you, then you say you'd like to take it slow on that. Then maybe a first session is with a paddle that doesn't sting or thud as hard and you only go for a minute or two. The next time you increase the length of play. Do that until you're more comfortable, then you can change to more intense floggers/crops/etc.

Same goes with anything, really. Start small, build up to where you BOTH want to be.

Also a good idea to go through a checklist together. That tends to get everything out there and helps establish your hard limits. Hard limits can change with time, so don't think just because you say "no!" now means that it can't be discussed again later if you decide you like the idea.

Whenever you play with something new, make sure you have safewords set up. Don't be afraid to use them if needed.

Think that about covers it. Communication, take it slow, safewords.

agreed and well said Kira.... communication is always important no matter your level of experience.

I agree with Kira and Mad...talk about it...experiment, be safe and use safewords, and explore!

Agreed with everyone who has posted.

Baby steps and communication.