Mods+Servers API

alright so to my understanding the mods are coded in C# for the servers correct?(yes i’m new to development of FiveM i havn’t touched development honestly since minecraft and it was just basic plugins then.

So my main question is: How hard is it to code a permission Mod into a server, and i assume it depends on the mods you have for weather you will be able to use permissions for those mods correct? If mod A has no functions to call upon you won’t be able to use mod B to control mob A. or do the Mods for FiveM work totally different then minecraft?(obviously yes since totally different games but you know what i mean)

Yes they work different, but there are also some similarities.

You can create resources using c#, lua or even JS.
Good place to start is docs.fivem.net and look at the dev section. You can also find tutorials in #development:tutorials, or look through already released scripts in #development:releases.