Can you buy digital comics with a debit card?

Hi. I'm new to the world of debit cards and credit cards and such and such. I'm on my Marvel app on my iPhone 5c and I'm at the part where I'm supposed to choose my payment type. I have the choice of Visa, MasterCard, Amex, Discover, and None. What happens if I choose none? Will it take it from my bank account? Also the billing address is under my mom's name. I take it I just leave it under her name right? I'm 18 and I don't pay for the bills (yet).

If the card doesn't have a Visa or Mastercard logo, you can't use it online. You could buy a prepaid card and use that. I don't know what that website would do if you chose None. Do they have free items?