How to use templates

If you installed templates correctly in new project dialog you should see that, when searching for msc:

Let's go and create this I named my Mod TestMod.

Go ahead and click TestMod.cs (or whatever you named it) on the right.
There are errors but don't worry, this is ok.
I think you already used MSCPatcher and installed MSCLoader on My Summer Car?
If yes go ahead, on the right menu (Solution Explorer), Right Click on references and click Add Reference...
In the new window click Browse... on the bottom
Go to \Steam\steamapps\common\My Summer Car\mysummercar_Data\Managed and select two needed .dlls

These are: MSCLoader.dll and UnityEngine.dll

You may also add: UnityEngine.UI.dll and PlayMaker.dll if you will be using them.

Reason for point directly to MSC folder is: you will always have up to date version of .dlls
Click Add and then ok on Reference manager and BAM you are good to go.

NOTE: When building mod, always make sure you are on Release

MSCLoader wiki