It's probably a good idea to do a few solo flights first, for instance retracing your QXC, before you take up passengers. And for your first few passenger flights, stay close to home or fly a familiar route. Passengers can be a huge distraction, even if they're not airsick, and it's best to make sure you have some spare mental capacity to deal with them.
I think there's a CAA safety sense leaflet about flying with passengers. Might be a good idea to read that.