So I played some with OOP, and it seems more better for me personally. Decided to use that. Made simple SQL resource, which works. But I guess I will have to re-code it to procedural, because there is no effective way to use export SQL functions in OOP to others resources. But it's no problem, because it's small code, so procedural works. And nothing is lost, because learned big OOP basics, and can read code easier in mind.
About 1 folder or smaller ones: Decided to use loads of smaller ones, because of features you and Dealman mentioned. But there is one thing going around my mind about it, what stuff should I put in "gamemode" resource? Like, there is loads of "scripts" login, jobs and stuff, so what is left to put in "gamemode" resource? Nothing? Doesn't seem that it needs to be one big handler, because there would be nothing to handle in it.
Thanks for answering to third question so detailed, it helped me a lot. Got better logic idea how stuff works.
So I guess it's just a personal matter, and best is the one, you like more.
Sorry for my grammar mistakes, living in a country where english is not the main language. I'm new to this stuff, so I can be wrong about it too. Thanks for so detailed answers, helped me a lot.