So you need a formal business structure to charge anyone any amount of money? I just made a proposal to advertise for a local business that will get me two figu

So you need a formal business structure to charge anyone any amount of money? I just made a proposal to advertise for a local business that will get me two figures per month if it's accepted, covering 25-50% of my current costs. I would rather not drop the money on an LLC until I have some idea of how it might get recouped...