Welcome.
I would suggest not doing anything to the auto if you only running 2 plants and will have no space issues. What I would recommend however, is to only grow branches from the main stem, no branches from branches.
Just germinate and plant to a nice soil. This will also mean you don't have to worry about nutrients much. I run autos in Freedom Farms, one of them is 1 month old and I have given zero nutrients so far, except a little Cal-Mag powder which also contains a slight amount of Nitrogen.