Online comics or comics on CD are no substitute for the real thing.
I prefer pages that have to be turned by hand, the feel of the book and the smell of the ink on the pages.
I'd suggest he first choose one or two superheroes or supergroups and stick with them.
Comics run around what, $2 per issue nowadays? (I haven't bought a comic book in years)
Even better, Marvel offers major discounts if you subscribe to them directly.
(I was thinking of getting a subscription to the Fantastic Four sometime soon)
http://subscriptions.marvel.com/