Published unique content, then try to rank on SERPs. The main focus is gathering visitor. Then you will understand yourself that, how to earn money now. Lots of advertising systems are waiting for you. You can earn money from "Adsense" "BuySellAds" "Content Advertising" more & more platform.
Google adsense is a good way to earn money if your blog has a good number of unique visitors. Apart from this, you can always sell advertising space for text and banner ads on your blog, or maybe even paid and featured blog posts.
You can earn money with AdSense even if you are not ranking, what matters is the PPC of the niche you are in. Some will pay a lot for a click and other will pay you pennies however, it does not matter is still money. Here are other things you can try in order to earn money with your blog:
Sell Ads to people on your site (usually paid by click)
You can do the above to start making a profit from your site.
Like Jaztez said, there really isn't an easy way to make money blogging (traditional blogging) if you are talking about earning any substantial amount of money. If you want to earn less than one dollar per day, then I suppose that would be easy. But earning anything more than that is more difficult than you probably imagine it is going to be if you go the traditional blogging route.
My advice if you want to make money blogging is to find a very narrow topic area that you have enough expertise about that you can really help people solve problems in that area. Build your entire blog around that one topic area. Create the blog with the intent to actually help those people solve that problem. Then figure out a way to monetize the blog after the fact.
The type of website I am suggesting you build is something called an authority blog, a small authority blog. Basically, it is a high quality blog/website that has high level information on it that people are actually looking for. By creating a site like that, it becomes easier to get traffic for and it is actually easier to build. And if you pick a good topic to build it on, then the content can be evergreen so that you don't have to keep writing new blog posts every week. You just publish however many blog posts it takes you to educate the reader to the extent that you want to educate him/her. Then you are basically done writing blog posts.
That style of website earns money in a more passive manner because you don't have to write new articles all the time. Anyone who has basic blogging skills can make one. It is actually easier, in my opinion, than building a traditional blog that you have to write new posts for every week. There is no guarantee how much money you will make with it. But in my experience it is a much better business model for anyone who actually wants to make money blogging.
If it sounds interesting to you, go to Google and do some research about how to build authority blogs. You'll see there are free guides you can download and follow for exactly how to do it.
1. Start a blog on a topic which you have interest in
2. Do on page SEO
3. Register with Adsense
4. Post Unique and interesting content consistently
5. Keep on sharing your blog posts on social sites
6. Do some off page SEO on consistent basis, even if you spend 5 hours a week, that would be fine. BUT NEVER STOP WORKING ON PROMOTING YOUR BLOG.
There are many models you can earn money from online blogging, there are platforms such as Hubpages that offer you some commission from writing and ranking a good post. However you use their property to do so.
You might start write some blog on your preferred niche, you shouldn't write randomly as it becomes more difficult to luckily rank in some long tail keywords without any research at this time.
To sum up
1.) Pick your niche, brandable domain, and hosting offer.
2.) Start keyword research you should give 50% of your attention here 30 for writing and 20 for revision.
3.) Optimize your article both on-page and off-page for your researched keyword, every article, post, category should have their own purpose and be able to rank in its potential keywords.
4.) Communicate with other websites in your industry, get visibility on social media, create your small followers.
5.) Now you can think of the way to monetize, will it be ads revenue, commissioned base affiliate site, or sell your own product?
If you have any question just drop it here and i can come back and answer it for you.
Earning sufficient job-quitting residual income through AdSense and PPC advertising would be rather difficult for the average blog. People who have successfully done this typically have some sort of highly unique/specific blog with a substantial following.
If one is looking to earn from blogging relatively quickly, using a blog to create and promote valuable content associated with an affiliate program with high-payouts is probably the most sure-fire way to earn right away through blogging. Other avenues do exists however such as video marketing, podcasts, etc.
There's no easy way anymore to make money with blogging... You have to have greatly researched, media rich content, and learn what works in your niche (in context of conversion).
You need to pick kw's (again, you have to have in mind conversion) and semantics, be smart on how to implement them and where to add them. You need to have a backlinks... and still fight against the competition (which can sometimes do negative seo on you)