Passenger transport licence with private vehicle

Good day together. I have the following question at the moment. I would like to “declare ready” to go to sporting events. Mostly with friends but certainly also with me unknown perons to fill the vehicle (1 + 8 seater). Now the question arises me if I can use the passenger transport ticket also with my own vehicle? Can you run these rides also over a ICH-Ag (small entrepreneur regulation) because I have a full-time job and this would only make on the weekend, and also only very irregular. Thank you very much