I think that NikoDoby has given some good advice.
Depending upon where you are applying and what they need, you'll want to make sure that what you have is technically perfect. That's harder than it sounds.
Part of what you might want to put together is a self assignment of a single photo essay - something to complete fruition - so you can show exactly what you can do. You can make it something local, just cover it as a reporter should, but using the camera. You need to know what that means.
The technically perfect part is the hard part. Exposure is pretty simple, but subject and placement of focus, DOF, clipping, and the other hundreds of things you'll need to get absolutely right aren't so easy.
You'll also have to balance the digital darkroom's ability to enhance images with the press's credo to present the news unbiased. If the photos are 'processed' that will be a huge reason to dismissive of your efforts.
Good luck and my best,