SmartThings Integration With Home Security

That’s what I am trying to figure out. There’s so many threads and I am trying to find out which could apply to me or my setup.

I just want to be able to use my smartthings hub to use the wired alarm sensors/siren. In the future I’d like to add cameras, but I need crawl before I walk. I am using this thread as my main reference.

Is that the best reference to use? Trying to figure out what my options are now. I am looking for the simplest route possible, as long as it works obviously.