This sounds interesting and I wish you great luck in finding good writers! A few questions of my own:
Do you use a wordpress-based CMS to submit content?
Is there a minimum requirement for the number of articles / words / characters one has to write in a given week or month?
Are there any guidelines regarding minimum / maximum word count and media integration (a minimum / maximum number of pictures maybe?)
How many unique views do articles generate, typically? (I know this probably fluctuates a lot, but a rough idea would be helpful).