A class has its own price per session, set on the class rather than inherited from anything else.
Working out the price
Think in terms of the session rather than the person. A class of ten at £8 and a class of six at £14 are close to the same money. The second is a nicer class to teach.
Filling versus charging
A cheap class that fills is usually better than an expensive one that does not, because a room with four people in it feels flat and people do not come back. Get it full, then look at price.
Taking payment up front
Classes are prone to no-shows because the individual commitment is small. Paying at the time of booking fixes most of that and is the biggest single thing you can do to make a timetable reliable.
Blocks and memberships
Where people come every week, a block of sessions or a membership is better for both of you. They pay less per session and you get the money up front.
Common questions
Can different sessions of the same class cost different amounts?
Sessions carry their own price, so a peak-time class can be priced differently from an off-peak one.
Can I run a free taster session?
Set the price to nothing for that session. Take the booking anyway so you know who is coming.
How do I stop no-shows?
Charge at booking, set a clear cancellation window and use the waitlist to refill anything that frees up.