Although my boyfriend is an AB/DL instead of just a DL, I think I know where you're coming from. I wasn't sure what I was supposed to do when I first started changing him and such, but all I had to do was ask and he told me. It's something we can easily talk about. But if he doesn't like talking about it, the best you can do is try things out and see what he likes and doesn't like. Treat him the same as you would if he didn't wear, and be open to any hints he might give as to what he wants. Communication is really an important part of this whole thing, so try asking him about it and see what he says.