For first time, I would suggest:
1) contact a lady you have seen before and had a great time when you were with her. Ask HER who her favorite doubles partner(s) are. Arrange the meeting through her. The session will be more fun if the ladies enjoy each other's company.
2) EAT YOUR WHEATIES!
3) Go with the flow during the session...let the ladies take the lead...If you have a preconcieved notion, you may be under too much pressure.
4) When you drop the donation prior to the session.....bump it up a bit over the amount you were quoted. Show you are thankful for what you are about to receive.
Enjoy and RELAX!
I have done a lot of doubles, but I will carry the memory of this session to my grave. Best 2 hours of my life:
https://www.eccie.net/showthread.php?t=925743