Yep I do a bit in these fields.
The first answer is “F/8 and be there.” a quote that's attributed to the photojournalist Weegee. No rocket science, right place, right time and both capture and deliver results, no excuses.
Second, network like crazy, it's a people business, the strangest hot leads often come from the most unlikely sources.
Thirdly get you yourself hooked up with the local picture editors, local press, magazines and the like. So they get to know you when you submit your work on spec (a few well scripted words along with your images, helps too). Because these days they seldom commission photographers as they have their own "staffers" to be kept gainfully employed. The only upside of that is, they can't physically be everywhere at once.
Also expect to remain fairly poor, photo rates aren't great in this industry, here in UK there are published NUJ rates, for the various publications, see link below.
http://www.google.co.uk/url?sa=t&rct=j&q=nuj%20photography%20rates&source=we...45512109,d.d2k
Hope this helps, I use it as only part of my work, along with other photographic activities.