welcome to AA, I'm trying goldfish too, and they're a lot of fun
... the best thing to do (everyone on here told me
) is 50% water changes every day.
your tank is currently cycling and it can take a month or two before the water calms down. if you post a thread about it under freshwater general health (I think thats what its called) You'll get a ton of help
Good luck on fish keeping, You'll really find it an awesome hobby