Advertising opportunity for Bus Co. in L.A., Ca. What to do?

Question

I was given a task at the Bus Co. where my husband is partner. I need to put advertisements on their buses. I don't know much about costs but the buses are tri-state. and have 36 routes. to find potential clients who would like to have their ad painted on the whole side of the bus for 1 or 5 years. They are preety desperate.!!! This is a great opportunity for anyone out there who would like to do this.

It is Tri-state. CA., NV., TX.
I really don't know about the price of the advertisement. It is preety much open to suggest. You name your price. They will consider it.
The space is one whole side of bus or whole bus.
The length of time is open to 1 to 5 years.
We are desperate!

Answer 1

#1 I need to know what is the cost to the person for advertising? #2 What states do the bus travel through?
#3 Is the rate the same for a non-profit, not for profit company vs profit making company?