I thought long and hard about posting this message, so here goes.
Before you post a personal ad, take a little while for the community to get to know you, get involved in chat, post in the forum's, learn a little bit about the community.
As people get to know you they will become more interested, and feel more comfortable with you. So instead of responding to a personal ad from somebody who is entirely unknown to them, now they have an idea of who you are, and if you are the type of person that they are looking for.
I really wished I would have done this before I posted my first personal ad.
Now people can see that I have a sense of humor, and am generally kind, considerate, and polite, and I'm not just some wannabe Dom, looking for a sub to beat on.