Welcome to reef2reef. Good to have you part of the club.
Decide now if you only want fish or your going to want corals. It makes it easier to go over to coral. That’s what I did. I added piece by piece over a year till I had a reef. I also have a fish only tank.
Basics haven’t changed much. Live rocks and sand. Uv are still around and used. Skimmers are also used but not the under gravel filters.
You have hob (hang on back) skimmers or in sump. Filters can be either canister, hob or sump. It really is up to you. Lighting is all over the board. Led, t5, or combos. Again it’s up to you.
Hope it help.