i would say on the protien skimmer to look at the turbofloater.
sand - youre looking for 3-5 inches of sand to create a dsb
. I used playground sand for all but the top layer and then i used "live sand". not sure if this is really necissariy, but i have tons of little things in my sand which do a great job of eating detris.
you should also look at the turbo or astrea snails along with the red- or blue legged hermit crabs.
lighting will depend on what else you decide to keep in your tank. corals will pretty well determine what lighting you will need.
you will want to research whch fish you are interested in getting and make sure of the order to keep everyone happy.
also make sure you either get an ro
system or plan on trips the grocery store or lfs
to get water.
live rock - you will want to get 1.5 pounds per gallon
hope this helps. read the articles on saltwater on aquariumadvice.com