Ok let us see how you can start a business online by only use a blog as a platform.

1. Set up an account at www.blogger.com
2. Give a catchy yet appropriate name for your blog cum business.
3. Find thing or product that can sell. Snap a good photo and start selling by uploading them as blog entry. Dont forget to write the details (Price, Information, Size, Colors, Availability etc etc)
4. Dont worry about your blog template. Search for a thousand of blog template and decor it with free widget and script. (Important script and widget : Chatbox, Orderform, Comments, Search Form,Google Blog Follower etc)
5. Target your customer. Promote your blog by leaving comments, ads and review at others blog.
6. List your blog at famous blog shopping directory like yourshoppingkaki.blogspot.com, http://blogshoppingdirectory.blogspot.com/ etc etc
7. Create your blog banner and exchange it with others blog owner especially those who receive huge traffic.
8. Exchange links.
9. Entertain your customer kindly. Reply each and every inquiry, comment and critic.
10. Dont overprice. Since you already have a free space to start your business, offer your item with price lower than market price
11. Reward your returning customer by offering them discount and free gift
12. Held a contest and give away presents for the winner
13. Provide precise information regarding payment and shipping. Don’t make your customer hesitate.