Anyone with Internet access can do a blog. Quite often you will hear people use WordPress to do blogs, but that product requires a more technical ability to set up and maintain. So unless you have the expertise or someone who will help you, it may not be best.
A popular blog site used now is Blogspot by Google. You create an account and then you create or post blogs. There is a space for the subject line and then text. It is very similar to email. Lots of people are using it. You can look at a blog I am doing there of a trip I am talking out west. I write each day on what I did. People can choose to read or not, and Blogspot is free. The site is http://dwighttravelwest2011.blogspot.com/.
An older product that I also use is yahoogroups.com It is set up a little differently: you can also email posted messages. I have used it since about 2000. I have a couple blogs there http://sports.groups.yahoo.com/group/ibbgcm/ and http://groups.yahoo.com/group/Watt-Thoughts/
With a blog, you can tell the world what you think and you can allow people to respond.
Send your questions to Dwight Watt at email@example.com. He teaches at a technical college in northwest Georgia and does consulting work for businesses and individuals. His website is www.dwightwatt.com.