Say I want to write a free eBook...

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Let's say that I want to write a free eBook and to use referral links that make it worth my while. Assuming that this book comes out to be of value, although short and to the point, would it be wise to give it away for free? Would it be more wise to sell it and omit referral links? Leave them in? Where would be the very best places to share my book if I am going to give it away for free? I want the readers to be able to download it immediately, meaning I would not want to collect their email first to try and sell them something later. I just want to do some experiments, but I want it to be all over the place - where would I promote it? It's a lot of questions, I know, but I want to get more information from others who have ideas instead of just sticking to my own. Thanks :)