BLOG = a Web site containing the writer's or group of writers' own experiences, observations, opinions, etc., and often having images and links to other Web sites. - dictionary.com
Essentially by writing about topics that interest you, and others, and having this posted online, you can earn a moderate income. As with anything you will get paid based on what you put into the process. All experts will agree that you shouldn't expect any signifficant $$ untill you have a decent product, and a solid fan base.
How much will I make?
The most common way to earn money from blogging is by hosting advertisements. These ads do not hold a static formula to calculate the income they will produce. Your income is based on how many people click on your ads. This is of course impossible to predict! For example, you may have 20 persons visit your blog and everyone of them decides to click on your ad. On the other hand, you could have 2,000 persons visit and only 10 click the ad. Of course, common sense will tell you that the more people that visit your site = MORE clicks, which naturally leads to... yep you guessed it... MORE $$
Getting Started
The great thing with blogging is there is not start-up costs or initial risks involved. If you have some free time in front of a computer you can start making posts. You can use your gmail account and get registered with Blogger Start Today!