You can offer your ebooks for free here at Mobileread, and at Feedbooks.com, Manybooks.net, and Smashwords.com. (And other places, but those are the easiest to find.)
You can charge for them at Smashwords.com, and offer them in several different formats, and allow people to download a sample (often, 10-25% of the whole) before paying. I've heard Feedbooks will be adding an ebook store as well. (Or I think I've heard that; haven't kept up with recent developments there.)
Our Workshop forum (under ebook formats) has advice & tutorials about document conversion; plenty of people can help you figure out how to get from whatever you've got now, to good quality sharable ebooks, in whatever formats you'd like to offer them.
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