What do I bring to the airport for visa on arrival?

Hi there,

I received my visa letter, but on the email it says that I should fill in an ‘on arrival form’. On the link given,  it says that I should complete two of these - submit one form to the Vietnam visa issuing office, or consulate, and the  other to frontier, police post upon your arrival - does this mean that I need to  supply one to the Visa office in my home country? Or is this all just  upon arrival?

Thanks,

Lauren.