Write her with honesty. Explain where you are at with things, where you have been, and where you want to go. Caps are used generally as they would be in any other form, though some prefer the word Domme to be in caps and of course their name or title. Like, let's say she will become your Mistress, I would cap that. But it all depends on her. Speak to her about it, really, she is the one that you are trying to please not us and all Dommes are different.