What Is A Blog?
A blog is basically a journal that is available on the web. The activity of updating a blog is “blogging” and someone who keeps a blog is a “blogger.
How To Start A Blog
If you don't have a blog you can sign up for one, free at www.blogger.com Once you sign-up with Blogger, start posting. Your artical can be about anything, just make it interesting where people would want to stick to your blog. Some people start a blog based on a topic that they are experts in, this is easy for some people instead of writing about something they know nothing about and having to do lots of research on the topic.
Once you have found a topic that your an expert in and have published your post, sign-up for the Google Adsense program, this is a free program all you do is sign-up.
Earn More
Afiliate programs: This is another way of earning extra income, you can sign up for free with a lot of programs like Ebay, PayPal, walmart, amazon.com, the list goes on. You can sign up with as many as you want and put the links on you blog so that people can join.