Although not a newbie to the hobby, I have never used an agency before and was wondering what kind of screening they do, if any (Park Asian is on my "to do" list).

I am finding it difficult locating new providers who don't ask for what I consider "sensitive" screening info. Although I understand why it's being requested, for me, anonymity is VITAL if I am to be in the game.

Anyway, thanks for any info on the agency question!

Usually they'll ask where you're located,meaning town and where you're staying....hotel or your private residence.They'll ask for your phone number and room number if you're in a hotel.They'll ask you your name.Then they'll say that they'll call you back in a few minutes.After they call you back,they'll tell you the rate per hr.They'll ask who,if anybody in particular,you wish to see and when you'd like to see her.At this point,she'll get your address or directions to your address if you're in a private residence.Usually,they don't ask for references or anything to do with your employment.

Im a newbie, only had 1 independant and I was wondering is it safe to pay for an agency escort using your Credit card, they take payment via paypal over the internet for newcomers.

I don't know where you're located but in the SFran Bay Area there are many provider agencies, overwhelmingly Asian, that only take same-day incall appointments.  They never ask for references.  Two problems there, you may not get who you want on short notice (do your due deligence before you call) and, second, the lax security does lead to their sudden closing down due to getting busted.  Always take a good close look around you when going in to one of these locations and don't linger when you leave.  Get in your car and get out of the area w/o delay.
As far as credit card usage goes, I would not suggest it if a all possible.  If you must, get a pay as you go credit card to avoid getting ripped off.