A great reference for installation, usage, and troubleshooting is the DCS Companion 3rd Edition by the late Barry Broskowitz. $31.85 on Amazon. Be sure to get the 3rd edition. The first and second editions are usable, but IMO are only worth it if obtained at a deep discount. (Right now, the 2nd edition is for sale on Amazon for 23 cents less than the 3rd edition, so you need to be careful.)
Finding hardware can be challenging. While many of us like the dedicated remotes, finding parts and repairs will be tough in the future.