I have no idea what size the Coopers Wheat Beer can is.
As for hops, the American Wheat I recently made came in at about 25 IBUs. I think I used 1.5 oz Willamette at 60 mins, and 0.5 oz Willamette and 0.5 oz Amarillo at 0 mins (don't have my notes in front of me...).
I used Wyeast German Ale yeast (1007) because my HBS was out of Wyeast American Wheat yeast. White Labs also has a German Ale
and an American Wheat Blend
. I bet either of those two would be good a choice. You could also just go with WLP001 California Ale.