Well, hmmm, I don't know much about Coffee Cup, other than it has been around a while, and was quite popular. Joomla, is really good but you may find the learning curve of it much harder than either Coffee Cup or something like NVU.
NVU is also real popular for people to get started with. Ewen Chia put it into a package a while back called MyFreeWebsiteBuilder
http://www.myfreewebsitebuilder.com/It may be good to start with something like that. There are many pro's and con's to either situation. If you learned Joomla early on, it might be beneficial to you later. Then again, it might be way to much for you to bite off, just starting out.
With all likelihood, for starting you would probably be more comfy with either the one above or Coffee Cup.
Cheers
Davin