You'll go through a few quests, strip engines from cars then crush them with the small crusher (Yup, there's a monster crusher in the full game). Before you get to crushin', you'll need to track down some abadoned vehicles then transport them to the shop using your tow truck.
We have cheats valid for PC. The list of consoles is continuously updated from PC, the date on which Junkyard Simulator: First Car (Prologue 2) was published.