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?