Take a look over at liveaquaria, they have a marine fish compatibility guide which will show what you can put with them. I recommend viewing it in Internet Explorer if you have it, there is a nice cross feature that only works in IE for some reason.
Anemones are a tricky subject, they should really only be added to an established tank, and once you have some more experience under your belt. They can be very tricky. I have seen people create beautiful reefs out of 50g, heck I have seen some 6s and 12s that are better then most peoples 120s. It all depends on experience, and how established and comfortable you are with your tank.
If you ever do decide to get an anemone (and any marine species really) you should try to get one that has been aquacultured. this means from a fellow hobbyist or trusted facility.