If the board has passed design rule check then it’s time to submit the files to the fabrication vendor. Many vendors are available now. Getting a board made is easier and cheaper than ever. A few I have used are listed below.
I use OSHpark most often. They are not the cheapest but it’s easy to use and relatively fast. Their website accepts Eagle board files. Directly uploaded Eagle board files are converted and preview images are created. Other sites generally accept gerber files. Eagle will generate gerber files – you’ll have to use the CAM processor and associated .cam files. These files can typically be downloaded from the fabrication vendor or you can create one. For making gerber files for a specific vendor follow their instructions and advice. gerbv is an open source gerber viewer that’s easy to use. Checking your newly created gerber files is a good idea.