Any good tut's on using this for noobs?
With that out of the way – the Usage section of the README is pretty approachable and about as straightforward as router testing gets: https://github.com/reverse-shell/routersploit#usage
2) Google what you don't understand.
3) Repeat.
Obviously, consuming all sorts of books and general information on the subject you wanna learn about helps, and can complement/substitute Googling.