Rob_2506

Hi I am new to this forum I joined about 1hr ago. I want to start modding GTA IV at first I was going to use my xbox but I think that you cant mod the game so that I can drive round in the proper cars. So I have decided to go with PC. I am running windows on my mac using bott camp. So the questn is can anyone tell me how to mod? I have no idea or where to start? Can anyone tell me what to do from initialling the game to installing the car mods like the Lamborghini etc. Please thank you