Just to add to what melosu said, corals are easy to care for as long as your water quality is good and your lighting is good. Most come mounted on rock already, so you just place it in the tank. If for some reason you can an unmounted frag (not attached to anything) break of a small chunk of liverock and use some superglue to attach it. Most corals are pretty hardy and have a good ability to adapt to their surroundings. I think fish are actually probably harder to care for and worry about than most corals are, if that is something you can use to compare.
As far as feeding, it depends on the coral. Some need lots of food, some don't. Some get their nutrition from the light, some don't. But for starting out...mushrooms, zoanthinds, and polyps are pretty easy to care for.
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