What to expect
Most men who join Date a Domme have not done this before and are not sure whether what they want has a name, whether wanting it is normal, or whether the woman they message expects payment. It is normal, she does not, and the vocabulary is covered properly in what is a domme if you want it defined plainly rather than guessed at.
The three mistakes that get people blocked
Dominant women who use this site tell us the same three things keep happening. First, asking what she charges, which reads as mistaking her for a professional. Second, opening with something explicit before either of you has agreed to that kind of conversation. Third, assuming a specific kink or scenario without asking what she actually wants. Any one of the three is usually enough to end things before they start.
How to approach someone properly
The first message to a domme goes through this with worked examples, and limits and negotiation covers how to talk about what you both want once a conversation is under way.
What this site is not
This is not a directory of professionals and nobody here is charging by the hour. What you arrange, and whether you arrange anything, is between the two of you. A paid membership buys messaging. It does not buy anyone's time, compliance or attention.
I am new to this. Is that a problem?
No. Most members start without a script. Read the advice pages linked above before you message anyone, and be honest that you are new rather than pretending otherwise.
What is the single biggest mistake to avoid?
Asking what she charges. It signals that you think she is a paid professional, which is not what this site is, and it is the fastest way to be blocked.