Quality content is content that people can engage with and find useful. Your content should help readers and bring them value. Your blog needs to have interesting, helpful content that people would be willing to recommend or share with their friends. The format, structure, layout (and, of course, the writing itself) will all determine the quality of your blog.

Notice that I avoided putting a specific dollar figure on the amount you can make from blogging. It will come down to your work ethic, your skills as a writer, your ability to generate targeted traffic, and plain old good luck. It’s a bit like baseball: everyone played it as a kid, only a small fraction make it to college ball, an even smaller number become professional, but only the cream of the crop makes it to the majors.
If you are new, obviously don’t try to fit all of these income streams in at one time. You should build on it and work on one at a time. Slowly build your income. Think of it in terms of a job. When you start out at a job you don’t usually start making the big bucks right away. After time and experience come into play, then you start making more and more money with raises and promotions. Now you can make a ton more money online than a typical job but it is the same concept!
One attractive feature of promoting digital information products is that the commissions tend to be higher than that of physical products; ranging anywhere from 10% to 50% or even higher. As an example, if someone is selling a digital information product for $500 with a 50% commission - you can earn $250 per sale. This is much higher than commissions on physical products due to the high profit margins.

I will quibble on one point though, your comment about BBT getting 13,000 subscribers before launching even though you “had nothing but a coming soon page and an invitation to join our email list.” As I recall, you also had a freakin’ awesome video on that page as well that just made people yearn to give you their email address, even without knowing a thing about BBT. So that didn’t hurt, either. ; )
If your niche doesn’t allow you to promote or build premium products (anything over around $100 per unit) then think about getting a solid mix of offerings and building it up over time. I remember Darren Rowse saying that initially Amazon Associates was a really small source of income but over the years it has really started to add up. Think eBooks, affiliates, consulting, books, etc. and you’re starting to build an income stream.

Hey Alex & Lauren! All this information has been so usefull and so easy to understand, i am very grateful. But i have a query, i live in a country in South America (Chile) where spanish is the main language, therefore i don`t know if its best to create my blog in spanish (which is easier for me because i have much more vocabulary and grammer skills) or go with the world wilde language English. Hoping to hear from you guys, thanks!
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.
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:
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