I realize this is an older post, but I just had to add my 2¢ for anyone else seeing it for the first time...
I know you're looking for the best way to SELL your ebook, so I am not sure if what I am about to present will even be worth your time reading, but, I'd strongly urge you to read it anyways and consider the possibilities.
I have been creating and selling ebooks for many years now. I have also sold tons of ebooks which I have received PLR rights to and, I have even converted many PLR ebooks into brandable ebooks, so, I do know a thing or two...
A strategy I see that works well is to load your ebook with subtle affiliate links (making certain that they are in-line with the topic at hand). Then, simply give your ebook away and let your readers give the ebook away as well (either as a straight give away or even resell it for a price). The revenue you'd make from flat out sales will more than be covered by what you could earn from affiliate commissions, especially if you're ebook ends up going viral.
Once your ebooks receive enough downloads and you receive ample followers, within your next ebook(s), you could sell ad space. (using paid ad links instead of affiliate links - or better yet, offer paid ads to the same products that you are an affiliate for -- earning twice (once from the paid ad and then from each sale of the product/service))
You could also turn your ebook into a brandable version, and selling the brandable version. The brandable version would of course allow the buyer/reader to substitute YOUR affiliate links with their own -- or even every other link, so that you are still earning affiliate commissions as well.
I have converted many ebooks into brandable versions, and have created and/or sold thousands of ebooks throughout my time online, dating back to when the internet was pretty much BBS (remember those, lol).
If that doesn't appeal to you, I would strongly urge you to create a separate FREE version which just SOME of the best info, but, even with the info you're revealing, do not reveal too much. Create a version with a ton of "snips" from the full version, and even within those snippets, blank the most vital information out. This will turn the window shoppers into buyers, those are truly interested anyways.
Once you've got your "give away" version ready to go, do not just allow people to download it. Use an opt-in form to require them to subscribe to your mailing list (but do not call it a mailing list -- it's your "Update Notification List" -- that converts better).
Once you have a mailing list, er, I mean "update notification list", you can then "notify" your subscribers of other products or services you think might interest them as well. i.e. if your ebook is about bass fishing, you could then promote another fishing related book or fish tracking software or whatever...
No matter what you do, sell of give it away, make sure you build a list (either a freebie-seeker list or a buyers list -- obviously a buyers list is much better) as these are people who have already shown an interest in your product(s) and are more likely to take action on your next product as well...
Another idea, if your ebook is pretty lengthy, is to turn it into a membership based access where you'd release one chapter at a time, 1 per month, week or every other day. You could easily set up a system using Wordpress or even Aweber (or any blog and/or mailing list service for that matter).
Another idea, to help build a "sales funnel" would be to record someone reading the ebook and then offer the MP3 as an upsell or if you know how to create slideshow presentations, create a video with each page as text and make it a "follow along" video type of presentation.
Another idea: Have you considered selling it on Amazon, or through one of the many affiliate networks (clickbank, jvzoo, zaxaa, paydotcom, etc.). If you're willing to give away a decent enough amount of the proceeds to affiliates, and the ebook is on a popular enough topic, you'd be surprised at how quickly
your sales could skyrocket with hundreds, even thousands, of affiliates promoting it for you.
Another idea: Turn your PDF ebook (a teaser version of course) into an exe version and give it away on the thousands of "software giveaway" sites (cnet, download .com, etc.). I've done this dozens of times myself and it always helps increase awareness which always results in more sales.
I could go on for days and days with tons more info, but I already feel myself getting way off topic, so, I will end with what I have so far...
One final note though, there are literally hundreds and hundreds and hundreds of ways to increase your sales. You just need to think outside the box a little.
If you'd like more ideas, or even some assistance or clarification on anything I wrote above, please feel free to send me a PM and let me know.
(hope this wasn't too lengthy or too off topic. if so, i apologize)