What you're trying to set up would be classified as a nano tank. You might want to try a board that specializes in nano tanks. Here's two.
www.nano-reef.com
www.nanotank.com
They will have more info on filters/pumps/powerheads/heaters, etc... that are appropriate for your tank. Like Narkon stated you really can't have very many fish in a 10gal tank, they simply need more room and produce enough waste that you're probably going to be limited to 1-2 small fish in a tank that size. Most of your shimp/crabs will be fine in that kind of tank. Do you want to try to keep corals? Anemones are mostly high-light creatures, there are some anemones that don't require light and they're beautiful, but they're not the type of anemones that clowfish host in if that's what you're wanting. If you are trying to get a clowfish/anemone pair, then you'll need to do some research as to what type of clown you want, then figure out what type of anemone they'll host in, then find out what the light requirements for that type of anemone is, and plan accordingly.
This board is a great place with good info as well.
There's also a nano forum on reefcentral.com
Brian