I recommend mods to make it a bit better, in general nationalization is nerfed by the devs, 3 mods fix this.

Fixed gov thoroughput

Fixed goverment debt

Theresias communist overhaul, this one is big and its great

Your country wont start as communist you have to get a communist goverment and enact laws that benefit the workers, its hard as most laws at the start consolidate monarchist and religious power.

To weaken the monarchy you need liberalism and industrialists but just enough to pass laws and not more, one you have labor movement and specially socialism you have to make the trade unions powerfull enough to start passing laws.

Depending on how long you take, and on how much you go against the current status quo you will get some slow reforms or a revolution. Most of the time I get reactionary revolutions because Im implementing universal sufrage and the monarchists hate it, for example.

Learning the economic game is also important, depending on the job people tend to join certain groups, peasants have no power and you should improve their jobs asap, make them farmers laborers and machinists.

You want farmers, they are not always helpful to socialists but they go against the monarchy as they want to own their land and help you pass homesteading and later maybe communal land.

Laborers and machinists will join trade unions and want better rights.

You also want to indrustralize your country in general to have your economy and army and not get bullied by france and britain.

Applying marxist thinking in general helps understanding this game. But as this is a game you can try to improve a country with godlike powers and some unrealist things will happen, like say if you manage to reform a country to socialism without any revolutions, you know the monarchy and capitalists would bring fascism into a civil war before that would happen just like irl. But the game tends to be quite realistic, I havent seen many silly things.