Q: Hello, when i was creating the apple ID and entered my billing information there was an alarm "your payment method was declined. Please enter valid payment method information" what does it mean? Thanks in advance

It means that the payment method that you were trying to put on your account has not been accepted as being valid by iTunes. What sort of payment method were you trying to use ? If it's a debit card then I don't think that they are still accepted as a valid payment method - they are not listed on this page and there have been a number of posts about them being declined

If it's a credit card then is it registered to exactly the same name and address (including format and spacing etc) that you have on your iTunes account, it was issued by a bank in your country and you are currently in that country ? If it is then you could check with the card issuer to see if it's them that are declining it, and if not then try contacting iTunes support and see if they know why it's being declined : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page