The motion lights and the camera are all great ideas! Easy to set up and you can't lie about a camera video in court. Also, get the local PD involved, get a report filled.
I work in the security field so I'll give you a little run down on camera's
Black and white camera will show a better image in low light than a color camera plus they are cheaper but you don't get to say the perp was wearing a blue shirt.
A higher end camera will auto switch from color during the day to black and white at night. But the price goes way up for that feature.
You will need to record your video, you can use regular VHS, Time lapse VHS, or DVD, or Digital Video Recorder, or your computor if you have the hard drive space. recording time- VHS 8 hours, Time lapse 120 hours or more, DVD, DVR, your computor, the sky is the limit money is the factor there. tapes are cheap, time lapse cost more but alot more can be recorded. You can also set up a motion detector that will start the recording when it sees motion, that way you are not recording endless hours of nothing.
Another easy thing to do if they are breaking in a gate or something like that is put an alarm contact on the door hooked to a bell or horn. That will usually be enough to make them run.
Or as others have mentioned, convince them that you are not people to be "messed with" Years ago we moved to Elizabeth City, NC on the outskirts of town, there was a housing development not that far away with lot's of people always milling around. If I was working late somebody would rattle the doors, tap on the windows etc trying to scare my wife. One evening my truck was in the shop so there was only one car in the driveway like I wasn't there. The same think happened and I went out the back door when I came around the front of the house I saw 3 figures going towards the back of the house. In the dark of night a .44 magnum makes a fireball about 2 feet in diameter when you fire it, plus it's a big bullet that you can hear going thru the air when it's coming towards you. Needless to say they took off back thru the thick underbrush in the woods. It was kind of funny you could hear branches breaking, them falling, ouch's etc. I put a couple more rounds in the air to keep them moving. A few days later I did see a couple younger guys all scratched up on the face and arms but we never had any more trouble at night.... funny how that worked out.
Steve in NC