Also responding as someone who has never been to a dominatrix before. In addition to the great advice that
@tiedinbluetights provided about letting someone you trust know where you are during this time, make sure that there is thorough communication between you two before engaging in any play. Topics should/may include: your bondage history, what you’re comfortable and not comfortable with (both hard and soft limits), what you’re specifically into (gear/fetishes/material/etc), and maybe even expectations. I would imagine she would also provide a lot of information as well: what types of things she provides and perhaps excels at, the structure of the session (perhaps starting then gradually easing into tighter positions to ensure you’re within limits along the way), expected etiquette, safety protocols, etc.
The fact that you stated you’re “terrified” and have never had “proper bondage experience” before I think really undermines the necessity of ensuring you know as much as you can about what you’re getting into beforehand. As probably everyone here knows first-hand, what your mind and body want/fantasize about and what they can actually handle (from physical, mental, and possibly emotional perspectives) can be on two very different levels.
Again, I would say to really know your limits—both what can be tested and possibly broadened (soft) as well as those that are a definite no-go (hard). The session should be “enjoyable” (quotes due to the nuance of having a good time while being spanked and/or tightly bound).
So, that’s my two cents. And as to your question of whether or not to write a story afterwards? The answer to that question is always YES! In as much detail as you can! Here’s hoping for a new and super exciting experience for you.
