The crux.nu website actually provides all the information you need in order to have your CRUX installation up and running. Especially useful reads are the handbook, the wiki and the prt-get manual together with prt-utils list for package management.
Since the last couple of months, I’ve been taking an interest in CRUX. I used this Linux distribution some 10 years ago and I really liked how the system was organized. It has a very nice handbook, which is a must during the installation. I decided to simply collect all steps I took in a “cheatsheet”, very similar to what can be already found in their wiki, as “Quick Install Reference”.