It's over a year out of date at this point, but the Beginners guide is good- the stuff it's going to be missing are Sidestories and the free Omega weapons you now get, and the late game stuff you don't need to worry about https://docs.google.com/document/d/...P3Hr7zTn6_fHeu24k/edit#heading=h.hut8fmku6jmd
Feel free to use Rare weapons and Normal Weapons however you want- there are some R weapons that you should be keeping for something later, but tbh it's not worth the effort to figure it out when farming them isn't that hard later on
Thanks! I will give it a good read.