Since your just starting out, if you don't have alot of Live rock
I would get a couple of Damnsels that aren't all that teritorial,
just tt the people at the fish store and they will tell you which ones you should get, a couple of shrimp, something similar to that which would keep some your sandbed clean, maybe a Clown also..
3 fish is too much for a 10 gallon....what is your setup like? Lighting, Skimming, Live Rock? If you have PC lighting, you could keep some Zoo colonies, a shroom or two, maybe a small LPS frag. IF you have the NO bulb on a standard 10 gallon hood, maybe some low light shrooms or Zoos. For fish and inverts, I'd get a clown, maybe a goby of some type. 1 Cleaner or Peppermint shrimp. I personally wouldn't keep an anenome. It seems like even the experts in here have trouble keeping them. Hope this helps, Mike
Damsells are good for beginners but almost all are semi-territorial, domino damsells about 2-3 and maybe a pair of percula clowns (domino damsells have also been known to devellop a symbiotic relationship w/ anenomes like clowns, so you could add some carpet anenome) would be good but you may need to upgrade in the future, 1-2 skunk cleaners would help you keep parrasites under control, I just set up a 150 gallon tank with #1 sand and live rock and I am using 10 blue devil damsells and 4 percula clowns to condition my tank, I'm really excited!