Two websites to start a blog: blogger and wordpess
Blogger is easy to use. The registration is fast and you can change the meta tags to increase your visibility in search engines. Posting an entry with links in blogger requires html tags
unlike in wordpress. wordpress has more professional-feel template and no need of mastering the html codes, everything you need is on their "create new entry" plate.
Now to directly answer your question: Start your blog with juicy contents that everyone can relate to. If you love to write, try writing a how-to article of 400-500 words. And after writing, attach an attractive image or worth-watching videos to your post.