As long as you have your Paypal attached to the payment details and upgraded to a premier account, important to accept payments for items sold.  the buyer only needs to go through checkout to pay, no need for you to send additional information, the system will send them in the right direction.

Just mentioning, don`t put COD in your pick up items, request Cash on Pick up,  COD is a costly Auspost service and does not mean Cash on pick up.