To start the game with full pistol and shotgun ammo, unlock the ability to save by sleeping on the bed in Roman's home. The knife is also helpful. Go outside Roman's home and kill a few people until the police appear. Kill a police officer and take his gun, then immediately run into Roman's home and sleep on the bed. Save the game if desired. When you wake up, your wanted level will be down and you will still have the pistol. Go back outside and kill more pedestrians. When the cops appear, run up the stairs and turn around at the top of the stairs, then face the door going outside of Roman's home. When the cops go through the door, pick them off with your new pistol. Watch your health and do not worry about picking up the guns. If your health gets low, sleep on the bed. Wake up and when you go outside, there will be lots of weapons. The shotgun will take longer because not every cop has one. However, if you enter the police cars that have been abandoned outside the apartments, you can easily get five shells for the shotgun for each car you enter.