Law / Registration procedure of a new vehicle in Poland - I have 1 year flat contract and meldunek, is it enough? [7]

Hey everybody ! I live in Poland- Warsaw. I'm not Polish.I would like to buy a new " 0 km" car in Poland.But i have got just visa and passport.I have 1 year flat contract and i have a meldunek. Is it enough for register this car in Poland for just use this car in Poland ? What am i suppose to do for registration of this car ? am ı suppose to go foreign office or something else ? Please help me about this situation ! thank you so much!