Affiliate Marketing Secrets

I have a passionate interest in human rights and, partly to help me find employment in this area as well as to exercise my interest in this area, I’ve had the idea recently to begin a blog.
But a blog is something I’ve never attempted before.
I was hoping some kind people out there in the Yahoo community could give me some essential tips on blog-writing, especially in relation to blogging on human rights issues. Any tips on how to think of a name, styles of writing the content itself, how to promote the blog, how often to write etc. will be greatly appreciated. One big area of concern is should I concentrate on a specific HR area (i.e. find my niche) or keep the potential content broad?
Michael 🙂