There are many photosynthetic gorgonians, which can be relatively easy to keep with adequate light. You have to know which species you have in order to know what they need. The bright red ones I know are non-photosynthetic. Brine shrimp nauplii can be used if they're non-photosynthetic, but it will be a challenge to get them enough food.
If you treat them well, corals will grow for you. The gorgonians will form new branches, the hammers will form new polyps. You will definitely need to keep your calcium and alkalinity at optimum levels (450-500 ppm and 3-4 mEq/l, respectively) for growth.
If you want to be successful with corals, I strongly suggest buying Eric Borneman's "Aquarium Corals," and buying or borrowing Sprung and Delbeek's Reef Aquarium two volume set (the hammer and the gorgonians are in volumes 1 and 2, respectively, so you can't just get one). Although the hammer coral is one of the "easier" corals, the books are excellent and will take a lot of the mystery out of the process of growing them.