I know c# pretty well but I am trying to figure out the layout I guess you can say for start to making plugins, for example, say I wanted to spawn something when a player respawns or spawns, I have no clue how to do so, so my question is.. is there a place to learn how to do any of that ?

You would need to use hooks like:
OnPlayerRespawn  or  OnPlayerSpawn

Which can be found here: https://umod.org/documentation/games/rust

My best advice is to download some smaller plugins and learn from them or there are few YT videos for the very basics 😁