As someone who has been in your shoes. I can only offer you advice based on my experience.

A Happy Massage is the gateway drug, they are a good introduction and a way to ease yourself in to all this. 45mins is a good time, 30mins seems too quick, and 1hr+ is for when you have found a provider you enjoy the massage and more from. Enjoy your experience, when extras come up sometimes simply asking "whats on the menu" will suffice, instead of worrying ahead of time. Then again, some places the charge at the beginning is all inclusive of massage and NHJ, just depends. If its 45mins, and 100+ its probably all inclusive.

The only other thing would to not let Decision paralysis get in the way. It might just be me, but when I have decided to go for a massage/punt I can often get stuck reviewing rosters for hours before deciding, or sometimes not deciding. This might just be a me thing tho.

Good Luck!