I spoke at some point about creating a wiki for our campaign and found a link to this very useful (and free) site.
Feel free to add your characters and the NPCs you have encountered. I will request that you leave the actual background stuff of the wiki for me. The NPCs though, I will expects you to write about. I will correct you if I feel it’s necessary.
The adventure log is where you can summarize what happened each session. I expect you to write something about chapter 1 (what happened so far).