I am in need of an adapter board made for a project of mine. Its sole purpose is to connect an arduino with a shield. In the case of what I'm working on, I have VERY strict space requirements and cannot stack the shield on top of the arduino. There are ways around this, like getting a module instead of a shield, but I want to dive into making a simple PCB on my own as a learning experience.
I can make an adapter PCB that allows me to place the arduino and shield side-by-side, and connect the required pins with Vias and solder them directly to the adapter board. However, I'm having a lot of trouble getting started. I won't need any components on the board, no resistors, no relays, etc. Just a plain PCB with connected Vias. I'm hoping to create a gerber file that will allow me to send this off to have ~5 of these made (again, part of the learning experience).
I've tried Eagle, but from what I can tell, it will only allow you to create a board from a Schematic. Since I have no components, its a little hard to start with a schematic. Is there something else I can use to create a simple PCB that outputs Gerber files? Maybe some learning/reading material for that website/program that is recommended?