I'm completely new to the scene, and contacted an agency recently, and it's been...sketchy. The girls who are available don't match the website and communication with what seems to be just one guy has been unreliable. Is this a common experience?

An "agency" can simply (and often) be one person doing the screening and scheduling for a roster of ladies. In short, as a newbie, stick to agencies that are reviewed and have a substantial history on TER. You can inquire on your regional board or PM those who have reviewed the agency's ladies.

Now, that is not an absolute as there are some legit, professional agencies and there can certainly be some very unprofessional Indy's, but if LE is a major concern for you, as it is with most here, you may want to stick to Indy providers.

Agencies, for several reasons, are more likely to be busted and your name could be made public in that bust. Just something to consider.