Get cameras, ring doorbell or something similar.There are security companies that provide off site surveillance and can give you a bundle deal. Cameras, lights and plain, visible no trespassing signs, and signs stating surveillance on the property. Lights near the doors should be the brightest of course. Possibly purchase a handgun and know how to shoot and use it. You can't go wrong with dogs who bark when someone approaches a fence.

With all that considered you've minimized your chances of a break in or theft on the property, but the one wild card that throws logic and reasoning out the window would be someone under the influence of meth.