Aim for the base of his spine. Along where the lumbar meets the coccyx. This should incapacitate him. And then, when he's down...
One bullet for each shoulder. Where the joints are.
A bullet through each hand. To avoid wasting bullets, a stomp kick on each hand should suffice.
Shoot his knees for good measure. Again, what a waste of bullets! A hard enough kick should dislocate his knees.
Gag him. Didn't mention what with! A strip from his clothes should suffice. But first, soak it in his blood. See, the torn strip from his clothes serves as a rag to clean up any blood you spilled from when you shoot him. Make sure to use the right cleaning agents to make the floor squeaky clean! And then, when it's soaked in his blood and cleaning agents, use it to gag him. Talk about reusing materials!
Hide him in the trunk of my car and place a heavy object on him, like a heavy wooden trunk (yo dawg, i heard you like trunks...) before the police arrive. The heavy object is to compress his lungs, so that it's a lot more difficult for him to scream for help. He'll be too busy trying to breath through his nose. I mean, what with the gag and all.
Tell the police that the killer got away. Also, before the police arrive, make sure you lock the garage. They'll find that the garage is locked, check for any signs of attempted entry, and if your garage doesn't have any windows, they'll move on to check other parts of the house, to make sure the killer is no longer there.
Open the trunk, feed him dog food. And by feed him, I mean take out the gag, spread it out in front of him, and pour the dog food on the gag. Don't take off the trunk, though. He'll try to scream for help. This way, he can either breathe or eat.
Keep him alive indefinitely. With this one, you'll need to somehow acquire the equipment to feed him intravenously.
Have him talk about his family, his children, their favorite songs, their favorite foods...
Go to his house, befriend his family.
Tell him about how his family and I are becoming fast friends.
Find out about his parents from his family.
Become friends with his parents.
Tell him about how his parents are doing.
Answer calls from his family and parents in front of him.
???
Profit!
I could go on for ages, but I'd run out of room.