When you set up your shop you have the option of accepting checks, money orders, paypal and credit/debit cards. Check and see what you have listed as acceptable forms of payment for your shop, so you don't have to go through this again.
Personally, I don't accept checks because they might bounce and then I would have to pay all sorts of fees. You could ask for a money order instead. Just remember to give EXCEPTIONAL customer service throughout this whole thing so you don't get a bad feedback.
Good Luck,
Hayley