Reverse prop is mostly a confusing misnomer. They are for the opposite side of twin engines so they can be run opposite directions which cancels motor torque.
You can use a REGULAR prop, numbers facing forward, prop rotation the standard direction. Think about it, thrust is forward no matter the prop is on the front or the back of the plane.
For a reverse prop, numbers facing forward but the motor rotation the opposite way. You have to reverse the motor (reverse prop) to get the thrust forward. Frankly it was a confusing suggestion from Grayson.
You can put any prop on backward and it will produce thrust but will be pretty inefficient. With few exceptions all props go with the numbers forward. With some inspection you should be able to figure out the airfoil and how it should rotate to work.