Ademco is good stuff, FBI is good stuff, there are others. But what is really a good idea is to get some proper training in that first before jumping right in.
It is not rocket science, but there are many legal angles to watch out for and blind attempts to add this as a revenue source can land you in legal problems. Also knowing which options are good options to program into each system is something you cannot pick up on your own, unless you like learning from the school of hard knocks.
