Inserting transactions with debit card, cheque and prepaid card

[Claudio Corti]

Dear GnuCash experts,

I have some doubts about how to insert expenses payed with debit card, 
cheque and/or prepaid card.
I'd say that a prepaid card is an Asset, so I should first do a 
transaction from my bank checking account to the prepaid card account 
and then a transaction from the prepaid card account to the expenses 
account, right?
But what about debit cards and cheques? They are not assets, they're 
just different ways of payment and, unlike my wallet, I don't have to 
transfer anything from my checking account to them.
Should I put in the transaction directly my checking account and write 
in the notes if the payment was with debit card or cheque? Or is there a 
better way to differentiate this kind of expenses?

Thank you very much,
Claudio