Set traps at right angles to the wall, with the trigger end touching the wall. Put them about 6 to 10 feet apart, since mice tend to travel very short distances. Mice tend not to cross large open spaces. Enlarge the traps by attaching a two-inch square of cardboard to each trigger, or you can buy the expanded trigger model of trap. When the mouse takes the bait, the trap will spring.
Check traps daily.
If nothing happens in a couple of days, move the traps to a new location. Mice are not afraid of new things or bothered by the smell of humans or dead mice on traps. If you have many mice, you might have to use a multi-catch mouse trap or a glue board. You can purchase these in most hardware stores. Again, check traps every day.