A simple but expensive way to buy small amounts of a Bitcoin for paypal is given in the tutorial linked below.
https://www.deepdotweb.com/buy-bitcoins-with-paypal-credit-cards/The only big drawbacks are you pay high fees, and your first Bitcoin withdrawal is delayed by 48 hours. However Bitcoin withdrawals are instant after your first one.
Basically the tutotial guides you through registering on the website below, depositing money through paypal, buying linden dollars with it, then buying Bitcoins with the linden dollars and withdrawing them. A bonus is you don't have to provide ID to register on the website.
https://www.virwox.com/