First time I've felt a twinge of uncomfort revealing specifics on here.
Usually I live a very open, wide open life. I don't keep secrets.
Except for security.
Something to consider. Once you establish your plan, contingencies, and strategy - keep it to yourself.
Add multi-camera DVR to the list. Doesn't take a technology degree to install modern systems.
I don't like not knowing what's going on outside at night before I myself step out the door.
I also like to know who is knocking at the door, so I know what I should bring with me when I open it.
Multiple communications options. Even simple things like "power" become relevant. Cell phone is a great tool, can't cut the cord, but will only be useful
if it's charged.
Don't tell people - ANYONE - that you're on vacation or away from your home. Save ANY information until AFTER you are back. Post your pictures of the fun family vacation once you get home. Not straight off your phone while sitting on a beach a thousand miles away.
If programmable, set your alarm system to call you FIRST, then the police / monitoring agency. When our office alarm goes off (bug in the wiring tripped it three times last year before being fixed), if I'm nearby, I beat the cops to the office and had checked and cleared it before they even arrived. IDENTIFY yourself immediately as the owner and don't brandish a weapon if you arrive first before they do.
When leaving the house / car, identify CLOSE things first, then scan further away. I'm more interested in the bad guy behind the bush 5 feet away than I am a bad guy two blocks away. Don't edge up on blind spots when walking around corners. Walk AROUND the outside enough to be out of arms reach. Even if you're just heading around the corner of the garage.
When using loud tools outside (lawn mower, weed eater, etc), remember to keep situational awareness up. You can't hear a bad guy coming up from behind.
Don't turn your back on open entrances. If you're working in the garage, shut the garage door, or work facing it.
Check doors before going to bed, make sure they are locked. If a door is NOT locked that should be, check the immediate interior - closets, etc. Just to be sure.
Dogs make decent alarms, they don't make decent defense. Count on them - MAYBE - to be an early warning indicator, in the best case scenario. Even dogs sleep heavy sometimes. They are not a reliable primary source of intelligence, even if they are your bestest buddy.
Train children to ALWAYS lock doors. My children know to lock doors behind them when they come in the house. Inconvenient? Sometimes. But not a bad habit to practice.
Lock your car. Unlocked cars are invitations to theft. Bad guys seem to sense the damn things are unlocked. Usually by trying the handle.
Position your furniture so you are not with your back to a window or entrance, if possible. If not possible use an obstruction. Well placed bookshelf works great. Most people won't even recognize such obstacles it as an obstruction / defensive measure if done in good taste.
Make sure your paths of movement are clear EVERY night for EVERY family member. Our kids pick up all their toys, every night. Period. Or they go in the trash. Being a hard-ass about this once, means you don't have to be a hard-ass about it twice. Kids know what it means when you get the garbage bag out.
Teach your kids to yell and retreat if they have chores at night (garbage, taking the dogs out). Screaming FIRE is an effective way of getting EVERY adult's attention in the immediate vicinity. It works much better than HELP, which kids have a tendency to scream when they are being tickled. FIRE is the de-facto "I need help right now" signal.
If my kid goes outside and I hear "FIRE!" I'm running outside a different entrance than they used, with an assault rifle, not a fire extinguisher. (that's revealing almost an uncomfortable level here, but worth mentioning - if you HAVE another exit you can use to assist a family member, it will keep you from getting bushwhacked the moment you step through the same door the family member just went out).
Eliminate blind spots and hidey holes. Got a niche a body could fit in that you can't see when you come in the door? Fill it with a piece of furniture with glass doors and shelves. Put some nice plates in it for your wife, she'll reward you. If a bad guy makes it through your (sturdy, reinforced) door at night, you aren't hiding anymore. You are hunting. Don't give THEM a place to hide. To succeed in a fight you have to be aggressive. Not passive. Passive people get their asses kicked. Aggressive people take home the prom queen. (State of mind, not a statement of fact)
Fire extinguishers on every level, in every garage (if you have more than one). Smoke alarms with fresh batteries. Smoke will kill you in your sleep.
Fresh battery backups - always - for your security system. Auto battery low "call the cops mode" helps. Power goes out you want that baby up and running 24, 48 hours minimum. Otherwise a bad guy can see you are on vacation, cut the power to your place, wait a day or two, and kick in the front door without raising the alarm. Having the alarm system call the police (and YOU) prior to the battery dying will ensure someone is there, on the ground, to investigate WHY you don't have power. If your power is tampered with, you know you are going to get hit.
Cell phone primary or back up dialer on security system. No exceptions, no excuses for land line dialers these days.
Internet lines can be cut easily. Don't rely on internet-based alerts or alarms. That works great for monitoring your HVAC or setting your DVR from somewhere. Not so great as a primary line of security.
ALWAYS keep your "go to gun" in the SAME spot, SAME position. Don't put a handgun in the cabinet one week, go shooting, and decide to put it in the drawer of your desk the next. ALWAYS THE SAME PLACE EVERY TIME. You don't want ANY indecision or second guessing if three bad guys kick in the door with ski masks and you have exactly 5 steps (or whatever) between you and them before the knife the lead guy has plunges in to your heart.
MAKE SURE You can reach your firearm BEFORE the bad guy can reach YOU. This means the firearm must be closer to YOU, than the nearest ENTRANCE point. As I type this I have a high powered rifle 2 feet away from me, butt up, so I can grab and go. Am I paranoid? Not one bit. Ready does not equal paranoid.
That's about all I got for now.