How can blogging make me earn money

If your blog gets a lot of traffic, you can have companies advertise on your website. But you have to be getting a lot hits a day in order for the company to want to advertise on it.

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Blogging can make you money. But you have to pick a topic that you are passionate about and willing to write at least once a week.Check out free videos out there showing you legitimate ways to use Google tools (search, trends, blogger) to start off without any money required - just a browser and internet connection. There are many scams out there but go with the trusted ones like blogspot, wordpress, etc. And get a good blogging guide

How can I increase visitors on my blog and earn some money

know how to design my blog and everything. What is the second step I should do to make my blog to earn money?.
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Just running ads won't do if there are no visitors, so first work to increase traffic, update your blog daily with very qualitative content, information so that more user become your subscriber. Let your blogs posting entice your blog readers; improve its look and feel, along with quality content add images, videos. Customize your blog by adding new widgets, plugins.

Put ads on it and advertise your blog by writing comments to others blogs and what ever you can do to tell others the address to your blog

You answered your own question. You said you wanted to make it "informative as well as interesting too". Do that, and the visitors will come.