UI Skin Creating- Help

[Travisimo]

Right now I am attempting to make my own UI Skin... but I've come to some problems.

SkinDefinition files are really confusing me... how do I create one? Correct me if I'm wrong but I think I have to have a SkinDefinition file for the Skin to work.

So far I've been editing the graphics so they look like how I want them in-game. If I put all those graphics into sub-folders in the main folder (the one with the UI Skin name) will they automatically be present if I load the UI Skin from the game? Or is there a code or something else I need to get them to work?

What do I need to do after I've made the graphics look how I want them? What is the next step?