1.
Step 1

One way you can earn money blogging is with Advertising.
Check into Google Adsense and Amazon Associates.
2.
Step 2

Another way to earn is with Affiliate Programs.
There are many online to choose from.
Pick one that is free to join and pays a good commission
for your referrals.
3.
Step 3

If you enjoy writing, you may consider selling an Ebook on your
blog. You can write about a subject you have much knowledge in or
interview and expert and turn it into a book.
You will need to learn how to create Ebooks and there are plenty
of resources online.