Newbie

Hi all. I'm venturing into the world of marine tanks etc after having kept tropicals for as long as I can remember. but new adventure. I have had my tank running for around 21 days, with live rock in. i introduced some live corals after water testing , all good. been a week now and water levels all good. i've read so much about time periods about adding fish and all conflicting answers. any advice would be most welcome. regards jay