How to add mods to a FiveM Server - FiveM Client Support - Cfx.re

Hello, I am new to this stuff and want to do some rollplay with a friend of mine. I just need some simple stuff in my server. (Some kind of Trainer to spawn stuff, Maby a map editor to place props and objects, and a skin changer to make custom skins like in GTA V Online.) I tried adding some of those things to my server (Hosted on my PC) but didn’t come far. I have the server running fine. But non of the ‘plugins’ load. I probably didn’t install then the right way. In my client I have the .a

Corruption uncovered Server loading error - FiveM Client Support - Cfx.re Community

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I cannot access any server - FiveM Client Support - Cfx.re Community

Cant join my own server? / Connection/auth. failure ERROR MSG - FiveM Client Support - Cfx.re Community

Fivem error probelm help please please - FiveM Client Support - Cfx.re Community

Placeholder error after loading screen to the server - FiveM Client Support - Cfx.re Community

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Help me i have to open my server - FiveM Client Support - Cfx.re Community