Nice article! Well every journey starts with the very first step which usually isn't the easiest one. What helps regarding 'ideas what to write about' is predefining an area of interest (e.g. travel, food, sports, technology). Then the world you're going to write about isn't endless anymore, and it's easier to find an appropriate topic.

I myself run accidentally into my topics. Usually they evolve thanks to the things that happen to me during the day in my real life. Imagine that my coffee cup falls down on the floor while having breakfast: then I'd suddenly think about gravitiy, accident, etc. In relation to "my area of interest" that would mean that I could write about: "The importance of gravity in sports (surfing)" or "How to avoid accidents in surfing"...
Then my brain tries to build bridges between my blog and real life situations.
Sorry for the long text :)