PayPal is one of the riskiest payment methods and a favorite of scammers. Ask for ID with selfies and signatures and check for photoshop. http://fotoforensics.com/ It is best to call PayPal and tell them you are selling bitcoin as they allow it.
Payment can only be sent as "goods and services". Bear in mind PayPal will take a fee on your end when received. By opening this trade you are acknowledging that you accept any PayPal-related fees and delays and once payment is made, you will release the escrow for this trade.