I have all my files for my website downloaded to cyberduck how do i go to my website i use my domain name?

Well cyberduck is just an ftp program, so your files can't be "on" cyberduck - so what'll you need to do is to get the credentials for the ftp account that should be in your dreamhost dashboard (or create a new ftp account if needed, and point it to your domains root (you should be able to find this in dreamhost's docs if you're not sure), and than once cyberduck is connected to your dreamhost's account, you just drag the files from your computers harddrive over to your servers hardrive, and cyberduck should upload all the files one by one.

Once they're there, your website should be visible. With how big dreamhost is, they should have good step by step docs that show exactly how their system works. The good news is it sounds like your DNS is already set up!