There's an old joke about a couple guys in a tent who hear a bear. One starts lacing his shoes. The other says, "you idiot, you can't outrun a bear." The first guy responds, "don't need do, I just have to outrun you."
Security is the same. You can't build a fortress but you can make your place substantially less attractive than others.
Burglaries are up everywhere. Where I live is no considered a "bad" area but our door was kicked in last year and my wife's car was burglarized last week (along with half a dozen others) when she was running errands. It was neighbors looking out that resulted in two of the burglars being arrested and my sleuthing on Craigslist that led to a sting that recovered a nice camera.
In a past life I have worked both in law enforcement and also worked installing alarm systems including multi-hundred-zone museum systems. Before looking at an alarm system be sure you have addressed physical security and understand burglary patterns. They aren't mostly at night - they are in the day when people are away. A typical burglary involves someone knocking on the door. If someone answers, they are "taking a poll", "sorry, I thought this was Mr. Smith's house", etc. No answer, they kick the door (or back door or jimmy a window).
Doors are pathetically easy to kick. Sure, you got that 1" deadbolt but it's still going into a piece of 3/4" finger-jointed pine trim. Several manufacturers sell long reinforcing pieces - basically a several foot long plate that replaces the strike and deadbolt plate and screws all the way into the stud with a dozen long screws. Still, a panel door with thin decorative sections can allow someone to kick through and unlock from the inside. Small sidelight windows, doggy-doors, mail-slots and the like can be broken or reached through to unlock a door as well. If you end up looking at any door upgrades you can find steel-framed doors with heavy-duty bolt systems.
You will need to evaluate your windows - too long a subject to get into but your friendly search-engine will help. Also look at your general property condition and things that might telegraph an empty house like uncollected mail, papers, etc. Most police departments offer a security check service that will help with all of the above.
Get to know your neighbors. Join/form a neighborhood watch.
Now that you have dealt with the physical issues so your doors and windows are solid and won't just rattle and cause false alarms you can start working on electronic.
I understand the desire to DIY for fun and to avoid what I consider to be insane monitoring fees. In the 20-years I've lived here I would have spent over $7,000 in monitoring which is less than we lost (not counting the door repair) even if we had no insurance coverage. But now with kids there is the peace-of-mind factor to consider. The trouble with DIY is that there are now excellent and affordable wireless panels that are quick and easy to install and have all the necessary backup batteries, dialers and the like. Plus you put up the "protected" yard sign to deter (although around here the burglars look at the signs from the cut-rate firms as an invitation rather than a deterrent - "hey, there's good stuff and they won't call the cops anytime soon"). I will be installing a system soon but I'm not going to redesign it myself.
Cameras are a deterrent, too, and there I'm looking at a number of DIY options for recording video. There's the "motion" software and a number of neat Raspberry Pi options. Several burglars have been apprehended around here because people had cameras. That's where I'm putting my DIY effort.