Paypal is generally not used in the community because of the charge backs associated with it. However, there is a process that will allow you to get just a few dollars into the ecosystem but you will be hit hard on the fees charged.
Step 1. Go to virwox.com, sign-up, get verified (optional but wise because withdraws will take 48 hours for security)
Step 2. Buy some SLL using paypal (only a small amount allowed - you lose around 18% of your money at this point)
Step 3. Buy BTC with SLL on Virwox.
Step 4. Withdraw your newly purchased BTC to a BTC-e.com, Cryptsy.com, Bter.com wallet.
Step 5. Buy WDC with your BTC
Good luck.