Blogs are easy to set-up and even easier to write. Setting up a blog on Blogger should take a few minutes, so is a blog on the free version of Word Press (www.wordpress.com), you can even blog on your Facebook page (they are called notes). Take whatever material you have available and cut it into article size pieces. Articles can be anything from a few senteces (about 250 words) to long stories (above 1,000 words.) A blog with five articles already looks like the real thing. This will get you going quickly and easily. Blog readers have the expectation to read original and fresh content. Your existing material, unless it is on a site with lots of visitors
If you can write on a regular basis and keep up with news, then by all means do so. Something we see as blog consultants: serious blogging work is started after , Blog content does not have to be completely new and original.