Just make sure that the e-book builds on your blog output—don’t simply rehash what they have already seen! After all, these people are now paying customers and will get upset with old information. Later on, as you become more established and your archived material becomes more extensive, you can poll your readers to learn what topics they’d be interested in learning more about and interested in purchasing.
One example is this: since our blog is a sub-domain for my wife and I’s boutique beach resort, nobody seems to want to touch me as a guest blogger. I get the same response every time “you’re commercial and so you’ve got to pay for a sponsored post”…and while yes, we are commercial and not a private blog per se, we’re a tiny family run business and 95% of private blogs are striving to be commercial, whether they’re associated with a company name or not.
Once you setup your account on AdSense you will be given a code to add to your blog. This code will automatically display advertisements on your blog from companies who are part of Google’s advertising network. You may see ads from small companies related to your topic, or you may see ads from large companies that are completely unrelated to your topic.