One of the very first blogs I started was right here at Blog Simply. Blogger made it easy to get started. Since then I've created over 50 websites, some of them still going strongly today. Some of them VERY strongly.
It was 2006 when I jumped into the blogging world - and made a run at it. I had many interests - so many different blogs resulted.
Today I get over 100,000 page views per day for my sites. I run Adsense on some of them, and make some small money from that (enough for a very nice car payment). Most of the income I get is from the couple sites I set up that SELL something.
If you are considering starting a blog - please, please be SELLING something - a product is best... a service works too... but, if you can find a product you buy cheaply and can find a market for that product. Well, there might be nothing better than that for a web business.
Blogging is fun... you meet a lot of people, and you learn a LOT about how the web works. Sell something though - if you're writing a lot - just write about whatever you're selling and make a small killing in the business world.