Tips for a new Umpire

[Forksref]

Always position yourself so you can see the ball.
Drop your whistle after the snap.
Stay with your keys.
Learn the types of holding. This will allow you to better spot a hold.
Be a good dead ball official: Don't rush the pile unless there is a problem there. Stay back and have a better view of more players so you can catch any cheap stuff.
Know your rule enforcements as you and the R will be working together on this.