Tip - Become a Blogger

You can start a blog of your own its pretty cheap do so. 

1. Register a domain (I won't suggest going after free blogs such as Wordpress.com or Blogger). It will cost you around $10.
2. Buy a Hosting plan - cost around $50 a year.
3. Install Wordpress CMS, free to download from WordPress.org
4. Select a niche you're expert in and writing useful content to give value to your readers.
5. Once you've published around 100 articles monetize your blog by applying for an account at Google.com/Adsense

Note: You need to learn:

How to select a business name & domain for it.
How to install WordPress blog
How to Optimize your WordPress blog (Moz.com got plenty of stuff on it)
Best Adsense placements for a blog.

Hope this will help you in starting a business by sitting at home.