Yoki, don't worry. I'll move this to the e-publishing section for you.
Whether or not you should accept the offer of publication depends on what the contract you've been offered looks like, whether this is what you want to do, and how you see your writing career playing out.
An e-publishing contract can lead to a print edition, if that's what your publisher does. Some e-publishers automatically also publish a print edition, some only do so if sales of the electronic book reach a certain level, so it's impossible to advise you here as much depends on which publisher it is you've received your offer from.
As for whether this is the kiss of death for your book, that depends on who the publisher is. Some are excellent: some are most decidedly not. But without knowing who it is, we're not going to be able to advise you I'm afraid.