Publishing elsewhere as well as/instead of on Lulu
I've recently published a book on Lulu and am happy with the finished product. I have set it up for general distribution and I know it will take a while for it to be visible on Amazon etc and I'm fine with that. I've also started work on an ebook version, which might take some time!
However, there is now a vague possibility that a mainstream publisher might now be interested. If this turns out to be the case, how do I proceed? As I "bought" the ISBN from Lulu I realise that I'd need a new one, and that I would need to make a new edition. Can I leave the current one on Lulu, or would I need to retire it? This is all a bit theoretical, but it would be good to know the procedure.
Thanks in advance