There is no right way - the whole point of blogs is that they offer a tool to express yourself and your ideas, find a new and original manner to do so, with as little right and wrong as possible.
My suggestion is just start - open a blog at any of the blog sites (blogger, blogspot, blogspirit - there are a lot more) and start writing as much and as often as possible. Use the blog address as your URL for social network sites such as flickr, myspace and facebook so that people will come over to read it.