In order to answer you question properly we need to know the following:
1. are you talking about leasing a vehicle?
2. do you own the vehicle...leasing it on with a expediting company?
3. are you driving an "owners" vehicle?
if you are talking about leasing a vehicle from one of the big three... Chrysler, GM or Ford... you will be held to your entire lease agreement>period. It matters not to them if you like the vehicle, if you are making money or going broke.
2. if you already own a cargo van, and you are "leasing" onto an expedited carrier, your expenses would be limited to you agreement with that company. if you simply go through "orientation" and decide that you do not want to drive for them, you should only loose your time and whatever you spent to attend the orientation. if you decide after signing on, they can and will charge you for Qualcomm installation and removal, decals, and anything else they can think of. check out everything before signing anything!
3. if you are driving for an owner and decide not to continue, then your financial responsibility will be determined by the owner. Who paid for the "orientation"? who paid travel expenses? did the van already have the qualcomm installed? were company decals already on the vehicle?
Help is all over this site. There are many really knowledgeable people ready and willing to assist, but it makes out task a little easier if you are more specific with your questions.
Hope this helps,
Tom Robertson