Now lets get this straight, there's a big difference between domination, bondage, and masochism/sadism. If you don't enjoy/want to be hurt badly, don't give him the go ahead to do so. Letting someone tie you up/surrendering your ability to escape, as well as any and all control of a situation, takes a lot of trust in the other person, as well as faith.
If you like being submissive, sight deprivation can really increase sensations, and some people like knife play. Even running a cold butter knife along someone who has been blinded for a lengthy period can feel very intense.
Really it depends on the both of you. Having a weird safe word is good (something like batman or puzzle or pizza, anything really)
You really have to test the waters and work out some boundaries and what you're comfortable with before you dive into the deep end.