If you're really looking to start your exchange service here in the forum, have you taken a look at the
Currency Exchange Section?
https://bitcointalk.org/index.php?board=53.0If not, consider making your thread there, but as of now, there are plenty of competition including several trusted and reputable forum members who has been in the business for years.
(i.e :
shdvb's thread ,
zazarb's thread)
(You better think of a way on how your business would be chosen/preferred, in addition to escrows of course since most of them offers them anyway.
Oh and, it's usually up to the client to choose/find a trusted escrow when they opt for that.
Take a look at those threads and see how it's usually run so you don't get tied up in choosing escrow providers.Good luck.)