Time to prepare to be a wagie tomorrow

26 year old poorfag here, how do I actually invest? My salary is 70k USD and my col is about 2k a month. Parents never taught me anything and lost the inheritance on stock gambling/debt so I'm working from scratch here.
Assuming we won't get ww3, what's the fastest way to retire at least before the age of 35 and start living off investments?
I currently have 20k cash saved.