Dokuwiki?

Hey, I'm a total novice at web codes and designs and whatnot. However, for my Senior Project in high school, I'm creating an online version of our school's coursebook. In doing so, I hope to customize a Dokuwiki to fit my needs. I was just wondering if anyone could tell me how to fix cosmetic issues like.. step by step. lol. I know how to upload it and make the site work and stuff, and I love everything about the Dokuwiki interface and usability, I just don't know enough to even put a banner up like the one of EoFF. lol. So... help?