Rabbit now has a documention site. Learn how to do basic setup, time sync, etc here. You should go over all the sections so you are familiar with what Rabbit does so you are ready to go before you start.
http://www.rabbitrally.com/docs/content/rabbit-rally-2-0-competitors/
Most of our events use the Digital Roadbook or RBK file. These are described below.
http://www.rabbitrally.com/docs/content/rabbit-rally-2-0-competitors/navigation/roadbook/
If you are running a rally that does't provide a digital roadbook, read up on the Stage Editor. Rallies in the US don't give you a speed table but you can gather the same information from the route instructions. You will want to use Reg. Numbers view or one of the Gauge views. Most rallies now use some form of "Control Zone" (CZ) to tell you when you will be timed. Set up a Stage in the Stage editor for each CZ. When you get to the start of a CZ, select the stage and enter your start time. This is often some fixed time of day plus your car number in minutes.
If the route instructions don't include all the mileages, create External References as described below. When adding External references pick a milage that you kn ow is greater than the real mileage. When you get to the instruction requirung a speed change, just press the yellow bar and it updates everything.