Step 1 in becoming a blogger is to consume some blogs yourself. Reading other blogs gives you a quick feel for what works, what doesn't, and the techniques you'll want to apply to your own blog.
There are millions of blogs, and finding ones that suit you can be like searching for a needle in a haystack. There's no easy way to filter out low-quality blogs--you've just got to sample what's out there.
A good place to begin is by browsing for blogs about your hobbies, pastimes and passions. You can find a list of the most popular blogs here: