Cash Flow Creation

I have a friend who wants to get into interstate trucking. He cannot afford to buy his rig but i am able to secure a loan. So i’m planning to buy the rig and he’ll drives it. How should the percentage of the cut be structured so that he can still have decent pay check and i can afford to pay insurance,all the maintenance and still have some cash to enjoy in the end.
I plan to hire him as a contractor so i only have to pay him. I’m new to this trucking industry so I am lost on what to expect?
How much will maintanance, insurance, and any other fee cost about.
I am not planning to pay myself for the 18 months but want to be able to establish a good cash flow so i can earn some money later on by being the owner of the truck.
Will it be better to lease a rig?
What is more profitable for the first years to lease the tractor-trailer to a certain company or be independent?, more