I would simply forget that idea! Reason? They are paid by commission and if you break even one small cute rule, you lose money.
Here is how they "Work",
You need to buy device UPFRONT, say SK2 for 350 dollars each, then Tmobile gave you rules for you to comply. You are require to run credit check and they give you credit code, and *IF* you sold to the customer on terms according to the credit code, you get reimbrushed of 350 dollars plus commission, usually 25-75 dollars each (Approximately 3 months after the product is sold), depending on volume of sales. BUT say you sold to a customer with worst credit code at discount, that is violation of the salesman term, therefore you get NOTHING. So, you need to be careful when selling Tmobile products, and who you sold to customers, plus be prepare not to get paid for at lesat 90 days. Sucks isn't it? You betcha!