M4 Mage Guide (A little bit outdated now, read description)
This is a little bit out of date now, and its also really rambly and not that good of a guide..
For better guides go to the m4newgens discord, they have guides for every class, a lfg system, and they're the biggest, most active m4 community. The guides there are really the best and most up to date of any m4 guides
discord.gg/QyXwYvdch6