Team Meeting Guide - This is the guide / curriculum for coaches. You don't have to follow it exactly or at all, but it has a lot of good information.
Engineering Notebook - This is for the kids. It follows the same lesson plan as the Team Meeting Guide and has space for the kids to write down notes from each meeting. I don't use this much except for the introductory information.
Judging Rubrics - These are very important! This is what the judges at the competition will be using to score your team. The team should be working through the season on being able to show the judges how the met each of the judging criteria.
Judging Flowchart - This explains how judging sessions will work. Basically the team will have 5 minutes to present their innovation project, then the judges will ask them questions about it for 5 minutes, then they'll have 5 minutes to present their robot design, with 5 minutes Q & A about it afterwards. So the team should prepare 5 minute presentations that demonstrate to the judges how they met all of the criteria in the judging rubrics.
FLLTutorials.com - This site has tons of resources for First Lego League coaches.
Unearthed Coach's Guide - This is probably the best, most comprehensive guide to coaching for new coaches to read.