Paypal will send 2 small amounts to your account, you will then have to confirm those amounts with Paypal to verify that it is your own account that you are using.
You can hold funds in Paypal indefinitely to use as money for items you buy on Ebay etc or any other Paypal user who you have transactions with. Much easier than cheques etc.
If its a Supra Club member, you'd usually send payments as a gift, meaning no commission is taken from the amount and the seller on here gets their full asking price for an item. You can transfer monies to your bank account (once confirmed) free of charge and it usually takes 3 working days. You can also request money from your account/card.
Email address to the buyer will allow them to pay you Via Paypal