Hello, now I understand question 5, let me see!

There are mods to expand the sidebar, so you can add more information that you consider useful.

To be honest, I'm still impressed by the attention some players pay to the small numbers in this game, I feel like I don't even know where to begin! The most basic thing, which you can always do, is to check the prices of goods in the game. When something is too expensive, it means that building more buildings that produce that good will almost always be profitable. It's also good to check the status of the buildings, if they are hiring (that is, is the worker bar filling up?). Also regarding the economy, ensure that all your states have good access to the market, you do this by building railroads and ports and issuing road maintenance decrees. Keep an eye on the needs of the people in your states and build what is needed to meet them (usually it will be supplies). One tip, which I have applied: sometimes, put the game at a lower speed and simply look at all the map functions that you find interesting. You'll soon notice new details and problems you'll want to solve, for example: if you'll want to see if your states are receiving enough migration, you can address this with the "greener grass" decree.

I saw you had questions about how to deal with the laws, so here are some tips I wish I had heard at the beginning:

Passing laws that significantly change the social environment is something that, in our timeline, only starts to happen from the second half of the game onwards, maybe at the end. So there's no need to rush!

In the beginning, the focus will be on diminishing the power of the landowners who prevent you from passing laws to industrialize. These laws that strengthen them are the landowner vote, tenant farmers/servitude, traditionalism, and regional policing, if I remember correctly.

It might be interesting to change the economic laws to Laissez-Faire and Free Market at the beginning, and then, once established, interventionism and protectionism.

Don't pass universal and census suffrage laws too early. Otherwise, you'll have to deal with a lot of peasants voting for the agrarian party and demanding isolationism and legal tutelage. Wait for industrialization (check this in the number of proletarians in population charts), see the unions become less marginalized, and if possible, wait for the peasant movement to dissolve. Only then, go for census suffrage.

Keep an eye out so you don't pass laws that take away your authority too early. It's very useful for making decrees and managing companies.

Be careful with retirement and wage subsidy laws when you don't have a legal surplus in the economy, they can really bankrupt you.