Use a contextual ad service. Once your blog contains high quality content and has begun to attract an audience, you can make money using Google Adsense, WordAds, or any other contextual ad service. These automatically generate ads in the amount, size, and placement you specify, matching the ads chosen to the topics you write about. The more readers who click on the ads shown on your site, the more money the advertisers will pay you.
Track current trends - What stuff is in the media right now? It's good to pick a topic with longevity (you don't want something that will fall out of fashion), but if you can piggy-back on a trend early on, you can quickly establish yourself as an expert on it before anyone else. Searching #journorequest on Twitter shows what kind of people/topics journalists are currently reporting on
If you are interested in covering a broad topic that many people already write about, create multiple specialized blogs instead and link between them when the subjects overlap. For instance, if you are a nutrition expert, write one blog about healthy weight management, another one about child nutrition, and another about growing your own vegetables.

Lets say, for example, that you refurbish and resell used smartphones out of your home. You could use a blog to attract visitors to your website where you list your current phones for sale. Your blog might cover topics about DIY refurbishing. On one level, it seems counterintuitive because you want people to buy your phones, but it also helps you build a brand and gain recognition. Social media guru Jay Baer explains the concept on Copyblogger:
A blog itself isn't really a business—it's more of a platform for other income streams. Your content alone won't likely make you money. Instead, you'll have to get advertisers, sell services like consulting or speaking, use affiliate marketing to get a percentage of sales from links people click on your blog, or maybe offer products like ebooks or premium content to actually generate income. ProBlogger has an excellent post about these different ways you can make money.

If you want to be famous or reach a wide audience, you will have to choose something slightly broader and work hard to make the best content for that topic. A subtopic relating to fitness, finance, or relationship advice is likely to reach the most people. Consider specific but broadly applicable topics such as managing money in college, or a marriage counseling blog. 

What is CPC? CPC stands for “cost per click.” By displaying CPC ads with Google Adsense, you receive a set fee every time an ad on your website is clicked by a visitor. The cost per click is set by the advertiser. (This is in contrast to CPM ads, where you’re paid for ad views instead of clicks. CPM means “cost per thousand impressions,” where M is the roman numeral for 1,000.)
Hi Sam! I love your site. We should definitely connect. I’m a school counselor and recently launched a site for parents to address pertinent teen topics. Like you, I struggle with the ultimate service I’d eventually offer on my site, but Ramsay’s idea is a great start. He’s absolutely right that people are looking for fresh content for their sites! Best of luck to you and I hope we can collaborate.
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