The new Introduction levelpack becomes the starting pack in new BoD releases - easy and nice levels demonstrating basic gameplay features should help new players learn basic biking skills.
By the way, the following enhancements have been added:
download Bike or Die 2.1b
Bike or Die in AppStore (the above changes are added in version 2.1.3, will appear in the store soon)
Bike or Die - Lite Edition (recently released free version)