Back after 20 years, need a little help

Hey all, had a reef tank when I was young about 20 years ago lol, wow have things changed. I just bought a 75 gal tank and stand, before I start buying things I wanted to ask what you all recommend for starting a new reef tank. I had the old sump system back in the day, I also now see LED lighting, protein skimmers, refugiums and more.... Can you all point me in the right direction?
Thanks