Watch this video from This Old House to learn how to install a deadbolt lock.
1 Position paper template on door edge; mark center holes on face and edge.
2 Drill face hole using hole saw; drill from both sides to prevent splintering.
3 Drill edge hole with spade bit.
4 Insert deadbolt into edge hole and mark its outline.
5 Chisel out mortise for deadbolt.
6 Screw deadbolt to edge of door.
7 Screw deadbolt mechanism to door, with keyed cylinder on the outside and turn lever on inside.
8 Mark end of deadbolt with felt-tip pen.
9 Close the door, throw bolt to leave mark on doorjamb.
10 Use strike plate to mark deadbolt hole on doorjamb.
11 Drill deadbolt hole in jamb with spade bit.
12 Use utility knife to mark mortise outline for strike plate.
13 Cut strike plate mortise with chisel.
14 Set strike plate in jamb mortise and secure with long screws.
15 Close door and test deadbolt.