Proper Corporate Setup for Enterprises ( LU )

I was wondering what the proper setup for enterprise corporations would be on LU. I have read some posts and have gathered that you cannot buy supplies at any quality; you need to sell at best price; and most importantly increase quality in all corporations by upgrading.

I am not 100% new to the game as I played a few years ago and created a small( but successful ) 200 corp enterprise before leaving, and had very few problems getting my corporations to produce profits, even as they were new. I'm not expecting 1 billion a month in profits per corp but I would at least like to get to where I'm in the green overall for my enterprise. Any further tips on how to increase profitability? Such as buying strategy\proposed salaries? Or even changes in which corporation types now produce the most profit?

First tip: wait 2 weeks for ending the automation process and then start.
Second tip buy some shares and experiment trade strategies on that company. It seems that the automation does not apply at those companies.
But you can lower the salaries at a percent that will not be very high, 300 is insane, but not so low, set it at 100 wait to see in what companies the employment is dropping and after that move through each corporation and make adjustments.
Let the automation to set the production and hiring, is easier.
That is for the start.