If you are thinking of starting an online business to make some nice income using your computer, a blog is a good place for you to start off.
You can monetize it in various ways, depending on how you want to do it.
1.
Advertising space You can select a topic that is in your area of expertise and create a blog around it.
Then sign up with Google AdSense and you are able to place related ads on your blog.
Depending on the keyword you are targeting for the blog, each click on the ads (from the visitors) will earn you money ranging from few cents to few dollars.
Of course there are other advertising programs that you can choose from besides Google AdSense, simply make a search on Google, and you will find it.
2.
Affiliate Products You can create as many blogs as possible.
No matter what niches you are in, there are related affiliate products that you can sell on your blogs.
For example, if one of your blogs is about dating.
Simply search for "dating AND affiliate program" on the search engines, and you will be able to find some affiliate products for you to market through your blog.
Sign up with the affiliate programs you have chosen, and you can start to make money immediately.
3.
Freelance job Blogging can be a good way to advertise your services as a freelance writer, web designer, photographer etc...
Since you are an expert in the area of field, writing interesting and valuable articles for your blog should not be a problem.
Update the blog frequently and you will have visitors subscribe to your blog's RSS feed, and subsequently engage your services.