First box of velocity = X axis = +East/-West
Second box of velocity = Y axis = +North/-South
Third box = Z axis = +Up/-Down
For a vehicle spawn facing north (check with an item spawn), use these two events:
(0) onBotTouch -> Player (Bot?) -> Set Datablock -> Standard Player
(100) onBotTouch -> Player (Bot?) -> Set Velocity -> 0 20 5
Spawn a horse on that pad. It should turn into a player and "jump" forwards.