Question About New Corporations

What are some best practices for choosing the industry of a new corporation?

And when in the menu for starting a new corporation, I see that various possible products are listed with a surplus associated with them that is either green, or it is negative and colored red. what does this mean exactly?

What else should I be looking out for and thinking about when building up my economy?

In short the best thing you should do is do a Keyword Search in the forum. Type in words and phrases of words. You can type in simple words like economy, corporation, finances, welfare ect ect and read the forum. The forum already has many arguments and instructions on how to build a strong economy. In the forum is basically everything you will need to know when it comes to the economy and how to play the game over all. You can of course ask questions too. This question is very common in simcountry since that basically is the main objective for most players in the game. To build either a strong economy, military or large empire.

Green means surplus red means shortage. You want to build corporations whos products are in demand and that stay in demand. There are many products that almost never go into surplus. Many of the corporations that are less profitable are located in ai countries no players control, so there's no major need to build such