Message the seller and between you both agree which method is best, you paying by cheque, bank transfer or a PayPal payment, or the seller can send you a Friends and Family PayPal payment.
If PayPal is used, email addresses need to be exchanged, make it very, very clear in your eBay messages, as eBay do read these, the reason for these exchanges. Make it clear it's not to be used for an off eBay sale.
@westonmanold