1. Zip ties/ratchet strap to hold it.
2. Wheel chocks
3. I'm pretty sure the pawl that locks the parking brake is located near the mechanism itself, as you can hear it audibly click when in the car. If it's a handbrake, you'll probably have to pull the center console to get to it. If it is a foot brake, you might be able to examine the mechanism by looking under the dash.