There are some awesome way to make money from blogging without any investment. I will make short notes about it below.
Go to free blogging platform like wordpress, tumblr, blogger etc. Sign up there and choose a sub domain from that site.
Start to write there and write regularly. Do not copy other post also write some post that can be helpful to others.
Use social media to share your site. Write some guest post in a popular forum and put your blog link there.
Everyday spend some time to communicate with your readers and answer their questions in the comment section.
When your blog becomes popular apply for adsense or affiliate marketing. If they approve you will start to earn.