You do read stories of women who reduce men to 24/7 sissymaids and permanent cuckolds.
Often I've suspected these were men living out their fantasies by creating an online faux-Domme persona that enforces them.
If her she calls herself Lady Sarah then your email should probably begin civilly and conventionally enough with "Dear Lady Sarah." Addressing her as Mistress implies a relationship with her that you've yet to earn. And if you've created a web page as I suggested above close your email with the URL.
State clearly and specifically what - if it was anything other than propinquity - that motivated you to write to her. More than just your cravings: that is just being pushy. Courting a Domme in certain respects is much like courting anyone.
The more selfhood, charm, humor and intelligence you convey the more you will seem worthy of attention.
You may get only a polite "No thanks" but that is better than dead silence.
That I've tended to get along with dominant women online is the only qualification I can claim for the following. Will pleasing another, serving her satisfy you deeply, make you happy? Or is it really having your shopping list of tortures and humiliations filled that matters most to you? But you need to be honest with yourself before you can be honest with the people you approach online.
I CAN'T FIGURE OUT WHERE TO CHANGE MY STATUS RIGHT NOW, I DON'T REALLY FREQUENT THIS WEBSITE SO I'M NOT FAMILIAR WITH THE USER INTERFACE OF IT.Really the question is what is wrong with your or at least your presentation of yourself? I'll Do Anything, there are plenty of you out there. Any dominant woman that responds to your email is apt to be a beginner. But there are pure masochists and sadists who only giggle at words like slave and Mistress. You'll need to make sure you approach women whose desires complement yours.Within a month promises of being willing to do anything will only prove to her that she doesn't want anything to do with you. Use Yahoo Geocities or similar service and create a simple web page. If you aren't able to write discursively and personally put up a simple slave's checklist.And there's nothing to be gained by trying to meet someone you can't satisfy or that would be inappropriate for you.Aside from the checklist you really should have a few paragraphs describing yourself and your interests outside of D/s.