A few questions from a begginer

[Red Earth]

-buildings
I've always prioritized buildings that give + tax first. More money early means a lot of money 100 years later. Like EU4 the earlier you start the snowball rolling down the more benefit you get later on. Eventually yes build everything, why not, but money first so you can build more faster. Once money buildings are done you can pick whatever you want

There is an argument for not building every troops producing building so you can influence the tactics chosen, but you're right not to burden a new player with that. The intricacies of combat tactics is a can of worms best left unopened for a while.