The Appellate Lawyer Representatives’ Ninth Circuit Practice Guide is available for the downloading from the Ninth Circuit’s web site. It’s a how-to for preparing and filing a brief in the federal appellate court out yonder in California. But it’s chock full of good tips no matter what jurisdiction you find yourself in.
You’ll want to look at the Top Technical Flaws In Briefs. Some of these are more than just technical. Don't make one of these head-shaking mistakes.