VIP membership allows you to read more of the reviews, and also allows for a better screening of what you're looking for.  Once you've found the physical attributes you're looking for, spend some time on the regional board in your area, and look for posts by those ladies.  It'll give you an insight into their personalities.

Nothing to be ashamed of there.

Try 1/2 hr sessions to try out different body styles, shapes, colors, sizes, etc.

Not all escort offer that but many do.  After a while you'll find out what turns you on.

Getting the VIP status will be a plus.

to begin to know what you like.  Plus, if you respond like I did at all, your nervousness the first couple visits will dampen the enjoyment some.

I like many jumped in with a couple young ones without regard for GFE factor and didn't enjoy the first two visits a lot.  But then I began reading reviews extensively and selecting 9 performance rated gals with good gfe descriptions in the vip portion of the review and have not had a visit I didn't enjoy yet.

And as Mr Fisher said, you'll learn what body types you respond to as well.