It's very easy to create a blog site based on a niche. Publish something important to people. Choose a good domain and theme and set up the basic SEO.

Afterward, traffic on your site will increase and apply for adsense. Once you keep updating the blog site, you can also get a good income.

Blogspot is a free Content Management System (CMS) from google which allows you to post content. It is the best tool with which you can start your blogging journey. It's hosted on google's own server hence can take unlimited traffic, also it provides you a free subdomain under the domain blogspot.com.

Steps to Start A Blog on Blogger

You need to start a Google Account for using Blogger.
Visit Blogger.
Choose Your Theme
Create Posts
There are a lot of tutorials online which will help provide you how to use blogger.
Rest if you want to create self hosted blog then we can get on call for discussion.