Get started on wikipedia and gain some experience doing small edits and learning the ropes. Time enough for big ambitious edits later.
I guess I might still try to rewrite the Obsidian Chronicles articles, but that still might be too ambitious for me, because in their current state, they are going to need alot of work, and im not all that fluent on the wiki programming language and formatting syntax etc. etc.
Regardless of how an image you have uploaded is licensed for use on Wikipedia, please include information on its source. This allows admins and other editors to verify the copyrights. This includes pictures you created yourself: if you took the photo, give yourself credit – you deserve it!
