how to :
get a measurement of your stick and the position of the buttons. or maybe you should look for it on the net, maybe there's a template going around.
edit the image.
print.
stick.

printing option : there're sticker paper out there. but the surface is like a normal paper. there's also glossy surface one but pretty hard to find. if you can only find a normal sticker paper, use a plastic transparent sticker leaf to cover the surface.

these paper costs RM1 for a leaf of A4 size.

or you can use a normal glossy paper but stick it using something else.

hi quality print for A4 is not much either. depends on the shop. RM5 per print is already too expensive.