awesome, that is a good position to be in, congrats! :-)
If you have a large enough pool of potential customers and are truly in uncharted waters, I would try some form of A/B testing on the price, starting with something that is a balance between a price the customer would definitely accept if your hypotheses are true and a price that covers your operating costs. After which, you can increase the price to new customers and see if it is still accepted.
I am far from a pricing expert, but I hope that helps :-)