I think buying a book about saltwater tanks or doing ALOT of reading online would benefit you. You can't just throw an anemone in the tank and it live. Its not a plant...its living. They need much more than regular fluorescent lighting. And good lighting isn't cheap. Definitely figure out what type of anemone you have and do some reading on it.
Please research before you buy fish as well.
There really isn't a way around spending a good bit of money on a saltwater tank...especially when you get into corals and anemones.