I believe you can add a solo card to a paypal account now as they want Paypal to become more appealing to eBay buyers and sellers and not everyone has a major credit card. You have to verify the card first though. They do this by charging you £1.50 (i think it was £1.50, it's not much though) to the card. When it shows up on your bank statement you will see a reference number. Go back to the Paypal site and enter the number. Your card will then be verified and they will refund £1.50 back to your card.
Oh and you need to be over 18 to sign up. :unsure:
How come you want to sell both?