how to make a book coverhow to make a book cover

Create Your Own Ebook Cover for amazon Ebook?

Ok so i wrote a ebook and this is my first book. So im trying not to pay some one to make the cover for me. Im pretty good with things like photoshop. So I say some stuff on youtube about using gimp. Any advice on this?

Next does it have to be a 3D cover? When I googled programs they all said 3D so do I need to do 3D or not?

When i put my word doc up on amazon should me cover just be on its own page with the rest of the book?

Any and all advice on first time publishing on amazon.com Would be cool. Thanks