I'm nowhere close to having the knowledge of a true Debian Developer, but I've used the OS enough to want to create my own packages. In this circumstance, I wanted a newer version of evilwm (it's 1.0.0 in the repo, and 1.0.1 is the newest release) and I wanted to change the mouse button behaviour. The steps I followed (I'm sure there's a cleaner way -- do inform me).