This will basically depend on the type of mod. Generally, there are different possibilities and ways to install mods.
you will be given the installation method in the description so that you can install the mod and the video Tutorial is also available in most of the Mod posts.
No, we only offer mods for the PC.
Yes, you can share the link of the mod post on your YouTube video and social media or website.
No! As most of the modders we think that modding should not cost any money.
In principle, as much as you want. Remember, that the stability of the game thereby may decrease. Best practise is, to install only one mod at once and test the game out.
Never forget to make backups!