Publish quickly, edit at leisure, make the first version coherent.

Publish quickly. The network rewards the first person to show up on the scene to describe what is going on, and it's important to get a version of that story underway promptly. 

Edit at leisure. The editing process takes time, and it shouldn't be unduly rushed. If necessary, work at it one paragraph at a time, and publish each paragraph after it is finished. Every single piece of work can be improved at any time by an edit.

Make the first version coherent. A first version that stands alone and accurate to itself might just be a concise headline and a lead paragraph. Each subsequent edit can grow the whole thing, but the first thing that hits the wire should be so fully composed that there would be no more reason to keep working on it.