Amended

What should show on an amended form before I fill in my changes? Should anything be there if I dyon't have to amend it?  If there are amounts there does it create a problem if I look at them?  If I put amounts in, such as sales "D" & "E" would they be listed twice or double the amount it should be?

Sorry to ask the same questions in different ways.   But I am so lost on what I need to do.