Answer 1

Try unreal engine. It uses C++. Look up c++ programming unreal engine. Follow tutorials.

Answer 2

If you want to create a game without any libraries or engines, you're going to have a bad time. Great difficulty.

Answer 3

@Ryn yes you can however its a choice you must make, take the easy route and use a program someone has already made or make your own.

Answer 4

Bro...Learn some OpenGl programming and try SFML and learn about TCP and UDP connections and all that stuff mix all and be happy ;-)