Take careful notice of the articles or profiles that get the best responses from readers.
Join organizations in which you have an interest. Read your newspapers or be a news junkie on the Internet. Watch local newscasts and seek out people who interest you.
The opportunities are endless, but nothing will happen unless you think, I could write that story. Then you need to do something about it.
"I think I could do that."
That's an excellent place to start.