Comics Creator could be a great tool to get you started on the way to self publishing but I don't believe it is the tool you'll want for all things. R. Scot Johns has a great website for learning Kindle epub production and he has tested KC2 extensively, giving a pretty good overview of it. Wonderfully, the epub geniuses out there are not shy about sharing their knowledge about how you too can create an epub file. There are many sites and blogs detailing their studies and methods. It is truly amazing how much info is out there for the aspiring indie publisher. All you have to do is turn off the TV and get started. What could be easier? I always remember the old saying, "Not begun is never done."
You can see R. Scots blog entry on KC2 here: