Before setting my prices I look at the ads that are around me and that have comments on HomeCamper. I also take inspiration from the prices of the other accommodations offers in the area (bed and breakfast, campsites, etc...) to stay competitive.
I can also create several ads from the "Your listings" tab, which allows me, for example, to set different prices depending on the type of accommodation (camper van, tent, hut, yurt, chalet,...) or for certain periods of the year; high season, events in your area (Tour de France, festivals, competitions, ...).
As an indication, the recommended price for a 50m2² pitch is about 15-20€/night and the price for a bare pitch is 8€/night per person, but it can vary according to the season, the region and especially the services available.