Kicad setup

Kicad can be downloaded from their website here.

Tutorials

Here are some online tutorials that explain stuff way better than I can

This video is pretty good, shows you some basics of Kicad, as well as some good practices for general PCB design.

This video series is outdated with the latest version of Kicad, but still does a good job at explaining the basic concepts and workflows

Kicad also has extremely detailed documentation on their website here