You have to have a decent software program. There are so many to chose from and none are perfect.
RMS uses cloud only which can cause slow responses. It will not be available if your internet is off. Limited installations.

Look at Starfleet, Centium Guestpoint. GuestPoint support is excellent. Expensive to start up but gives nearly everything you want. Don't use cheap or free software. This program is your business. Spend the money.
GP includes links to channel manager, SMS Textin to guest, stats, great accounting, free support, training for relief manager, numerous installations.

Resale will be better with good software. We dumped the Spreadsheet rubbish on day one. You have to be serious about your software. And you need something that is recognised by future buyers..