I use
Comic Book Archive Creator when I have a zip file.
Then I import it to Calibre and use the
Open With plugin to open it with
ComicTagger to get the proper metadata.
Then I use
Embed Comic Metadata to import the new comic metadata into Calibre.
For viewing itself, don't use the internal Calibre viewer because it kind of sucks for image-heavy formats. I like
YACReader but there's other programs too. You can disable the internal viewer in Preferences > Behaviour.