"Play nice. Be generous with your information. Be polite, helpful and above all open to other people's suggestion even if you don't always agree with them. Maybe you can come up with another way? Being negative is only going to bring you negativity."
"9. Don't ever, ever send out half-baked material. Do the 'power of three:' Write the first draft, and make it as good as you can on your own. Show it to three positive people (you don't want sneers from a bitter, twisted frustrated writer in a black linen jacket, smoking roll-ups). Teach them how to give you feedback: you don't want them to start rewriting your script for you. Get them to ask questions, eg "Why did your character do that?" Buy your readers a drink or have them over: treat them as professional contacts--this makes them take it seriously. Make notes on their questions, don't argue, or tell them they missed something. You've got three people. If they all ask the same questions, you have something to sort out. Rewrite, then have a new set of three read it. Then, do it all again. 3x3=a polished script. It helps, too, to rest the script a week or two between drafts, as this helps you find stuff you somehow missed."