Go to work on the ground crew with a operation that has a few pistons. After a year you'll know if you are going to be flying one and will discuss it with the operator a ag course...

You can try to skip that and go to a AG course, such as flying tigers out of Rayville, La and start beating the bush looking for a seat. Taken of course you hae a hundred Hours tailwheel or so.

Most operators are family operations and flight times/requirements can be wavie for the right individual.