Welcome to MR, sponder
Have fun learning about your Cybook and just jump in and ask and someone will chime in with an answer or point you to a thread with more information.
You can do a search to check for information or at the very top of the page is a link for our Wiki also.
I don't know a lot about what formats your Cybook uses but, there are thousands of free beautifully formatted ebooks done by some very dedicated members of this site. Just check which format you need. The above blue bar has a drop down menu for the ebooks.
Have fun and be careful, this place is addictive