New Reefer

So I’m a beginner at keeping a saltwater tank but have kept my fair share of freshwater tanks. I’m needing a new hobby and wanting a tank in my home again and have decided to go the saltwater route. I’ve thought about going with a 20-30 gallon tank, but have been swayed to go larger so I’m planning on a 55 gallon tank. Hopefully I can find a decent tank, and stand on craigslist. It would be the largest I could go in my home and where I would like to display it.

Anyway, I don’t think I want to go the route of a sump/refugium because I live in the country and we experience multiple power outages due to weather and such. So what would be my best route? Hang on back filter for carbon, and hang on back skimmer, and in tank heater and powerheads? Honestly I don’t mind having equipment showing in the tank. Also I’m on a well, so would purchasing RO water from the supermarket be an okay option?

I would like to set this tank up as a reef tank. Keeping some of the softer corals and staying away from the harder stuff, for now. My daughter would love a clown fish and a blenny, so that is something I also know I want. Possibly a pair when talking about the clown fish. Other than those fish, what would be some others that would be good in a 55 gallon tank? Triggers are my favorite fish, but I know they are aggressive and like to munch on coral. It wouldn’t be safe to keep one right? I don’t want to rush this and am willing to take my time to make sure my tank thrives.

Any help would be greatly appreciated.