My dad does this full time, but he is a independent freight broker for a trucking company. They set you up on their system, but you do the rest from there. It's wicked easy, I used do it as a summer job. You literally just need a phone and a computer. You find loads on websites like getloaded.com and plug them into the computer. It sends a texts to drivers offering it. If they want it, they call you, you call the company, and get the info. You then e-mail the drivers the info. Check in for 2 minutes everyday. And when they deliver it you're done. It's a 6-10% commission based on the type of load.
It's nice. You don't work for the company, so the time you put in is all up to you. All of the billing and financial stuff is done by the carrier. I remember days off from school when I'd wake up at 10 and my dad would already have 1500 in commission down.