I think especially for new Doms, like myself, maybe the best question you can ask is to her: "What exactly is it you want done to you"? Phrase it however you want, but listen to her words. She's not going to tell you to do something she won't enjoy, especially if she's got experience as a sub. Listen to her desires... and make good on them. It doesn't have to be perfect the first time. Like all other things it's a skill and it takes practice. If she's the more experienced of the pair, make use of that. Don't be afraid to ask questions of your sub - they know better than any what it is they seek. I think this is especially useful in defining punishments for breaking rules (which I find somewhat challenging without some input, I think striking a balance between making punishment a punishment without crossing the line into outright lack of enjoyment is very important).

Read, both the knowledge here, stories, anything. Don't be afraid to push your mind into gray areas. Test yourself. The great thing about words is that if you definitely don't enjoy something, there's not much consequence to having pushed a limit on paper. Find out what you like, what you dont, and what you're unsure about. I even go as far as reccomending that new people read at least a bit about things they *think* they won't enjoy - I discovered an interest or two that way.

Don't be afraid to shamelessly rip something off from stories or people you talk to. If it works for you, go for it.

Welcome, and have fun.