welcome sweetanna id go with what J-Go says although being a bit more negative i'd also say going by experience that when people say they like or even show a bit of rough and pretty collars etc that a lot of the time it's more fantasy than anything.

but saying that go with that fantasy and try encouraging him a bit
show him a fe pics on the net ...just go easy and show the light stuff, a little bit at a time get a few toys (nothin major!) dress up a little act a little extra submissive than you normally would in the bedroom.
ok a lot might say thats a kind of topping from the bottom thing but he's not a top (yet ) and everyone needs some encouragement to begin with.

sorry im probably the one who sounds patronising! but in all honesty whether you're experienced or not you can probably sense for yourself if he's likely to be ''into'' bdsm in any shape or form or not.