The answer is yes. However, I would caution against it. The reason is, when you use a free service, you don’t have as much control over your blog—the free service does. This can be risky, especially if you will rely on your blog for income. A self-hosted WordPress blog is my recommendation and can be started very inexpensively. See my step-by-step tutorial here.
Warning: : When I say be sincere, I mean it. People can smell an insincere pitch a mile away. I was guilty of this when I first started blogging. If you start out becoming friends with other bloggers first, sometime in the future they will help you with your eBook launch, promoting your blog, your course, giving you an introduction to someone – whatever – because you’re friends.
As you build up your blog, expect to receive multiple sponsored post requests each day. These native ads can be a highly effective way for businesses to reach your audience in a non-threatening way - and they can be a highly effective way for you to make a lot of money. Just make sure the posts are actually interesting and relevant to your audience, and that you fully disclose the sponsored nature of the post.
Have in-depth knowledge in your niche? Package it up into an ebook and sell it on your blog. I'd generally advise against selling it (at least exclusively) on Amazon or Kobo, as you'll probably be able to charge much less. If you've already built up a solid audience, you can probably change anywhere from $5 for a very short one, all the way up to $39+.
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.