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Head over to Amazon and search for some books about your topic. Have a quick look at the Table of Contents section of the books (to give you an idea of what topics were covered), and more importantly, read the reviews that were left by readers. Negative reviews will often reveal the topics that readers were hoping would be covered (or covered in more detail) in the book, but were not.
BoFu: Bottom of Funnel sales funnels are for hot traffic. The prospective customer likes you if they've made it this far. They are ready to buy. Typically, this is a sales funnel page where you offer a product/service and ask them to buy. In the process of ordering your main product or service, your sales funnel with present a variety of other offers to increase the order size. For example, order bumps, upsells, downsells (if they don't accept the upsell). Sales funnel templates make setting these up easy. Watch Me Build A Profitable Sales Funnel Using Clickfunnels In 10 Minutes [FULL TUTORIAL]