Just another beginner asking for help

Hi. I've been thinking quite a lot about creating mod for rust. I am a bit familliar with C# and i already have Visual Studio 2017 installed. What should i do next?

 

Check the api: Oxide API for Rust it's not always the most updated thing, but it helps some.
You need a decompiler, I prefer ILSpy, but there are others (telerik decompiler, etc). Use it to look through assembly-csharp.dll in your managed folder for rust.
Look at other plugins for code examples/how to implement things. If you have an idea that's partially implemented in another plugin, look at its code.

Get familiar with google and the forums search function so you can find a lot of your answers without having to wait on a reply, a ton of things have been answered already, like this question