What topic should i blog

Oh dear, I've been sitting in front of my laptop for 4 hours, thinking of what topic should I blog.

I started blogging last week of March, I never do this before. I like it because its a good hobby, and I put adsense on it. And picking topic to blog about is harderst thing and it happens all the time. Im interested in everything like celebrity news, health news, music movies, and a lot more, that's why I'm confused if I should stay to one topic/category, or I should blog about everything.

I need some tips about blogging, please help! Send comments on my blog. How should I improve it.

Thanks!