I would get a copy of "The Conscientious Marine Aquarist" by Robert Fenner to start with. In a 10g tank, I wouldn't go with more than one clown and that would be the only fish in there. You don't really need a skimmer on a tank that small...weekly water changes will keep contaminants diluted and trace elements replenished. If you intend to keep corals in the tank, you'll want to have something more than NO
lighting. A couple of 36w PC
's, one 10k and one actinic, should do well. You could keep a cleaner shrimp or a couple of peppermint shrimp in there as well. You'll also want some snails...probably 12-15 total of different types. I'd put in at least 15lbs of LR
if not 20lbs. If you want find sand, I'd get some Carib Sea Aragamax. If you want something a little more course, check out their Special Grade Reef Sand. Usually, I'd say to get Southdown due to cost, but one bag of Carib Sea should easily do a 10g. I would get a couple of small powerheads for circulation...you could also use a small HOB
filter without the cartridge. You need a minimum of 100gph and I'd shoot for at least 200gph total flow.