Should I ?
 

Been thinking about this for over a year should I use a pro dominatrix for my dark fantasy. Any advice guys...

Depends, what's the fantasy?

Not nearly enough information to form an opinion over, sorry.

You might want to check out websites like FetLife.com which is a bdsm social networking site.
There are folks there with all kinds of interests, which means you could find a dominatrix just
right for you who isn't going to be a working professional. Might be easier (and cheaper) in the
long run to have a mutual personal relationship than something strictly commercial.

But yeah. "Dark fantasy" doesn't really say much. *shrug*