There are a few basic steps to making a PCB. First is designing the board in Eagle or KiCad. The next step, putting the design into copper, has a lot of techniques to choose from.

There are plenty of tutorials about making a functional PCB, but finding information about PCB art can be more difficult.

This article presents a practical approach to the layout design of mixed-signal boards, discussing component placement, board layering, and ground-plane considerations.