I personally would like to contribute mostly about the editor, whenever that gets released. Because quite frankly, I don't think that Larian is going to include an 'instruction manual' on how to use it, and people will be wanting to make their own campaigns and such right off the bat.
Well to quote Larian from the Steam Forum about the editor: "The editor is going through an important "internal" test next week and if it passes that, in theory it's ready for public release. We'll see then how we're doing on integrating feedback and release it when we have the resources to handle the support the editor will undoubtedly require. It's a very powerful tool but powerful tools have the nasty habit that they're complex.
Also, we still need to prep a decent manual/tutorial ;)"
So there is talk of there being a guide for the editor. Although at first it may be minimal and those of us that want to test it out will furiously be figuring out what things do. By launch it should have a complete manual/tutorial coming with it.