A lot depends on how you "click" with the lady, if the chemistry isn't right even a stunner can be a disappointment.
Therefore older ladies are usually better, English ensures the communications are good.
Adultwork, has a few excellent ladies, a lot of poor ones and some who will only scam you.
For the first time take it slow and perhaps just a hand-job or oral.
I have used Cherry Girls, Julia now retired was wonderful.