Keep in mind that as a submissive myself I find Domme tendencies very hard to understand but the best thing for a sub when being dominated is knowing that you have pleased your Dom/ Domme - so get him to do whatever would please you.
Try something as simple as next time you're having a bath or shower ask him to come and bathe you or when you're having your next private meal together insist on feeding him - ofcourse that only works if he's a lifestyle sub not merely a bedroom one. If he's only submissive in the bedroom then your tactic sounds like the perfect one - then you could expand onto chastity belts or cock cages and the like. If he has masochistic tendencies you could try some lower powered electrical devices or low temperature candles.
There are also a heap of useful sites on the internet.
I would advise staying away from anything that claims to have personal ads and to be very very careful when they offer chat rooms. Very often in my experience there are alot of want to be Doms there - in other words people who claim to be dominant but don't accept all the obligations that come with it. Here are a few useful websites.
Adult Resources for BDSM & D/s Erotic Relationships
A submissives journey ~ The Dom's Lounge
Both of those have some great info - there are a heap of other sites out there but I've got to admit that any of them that start to refer to subs as bitches or the like and I tend to automatically close them - just cause I'm a sub doesn't mean I don't have my pride and there are very few people out there that get to refer to me in that fashion.