I'm just finishing my endorsement with Melbourne Seaplanes now. I highly Recomend them. The Text I have used is Notes of a Seaplane Instructor, by Burke Mees, I had trouble finding any other recomended texts. If you do it in Melbourne you will recieve a binder full of notes as well. The whole thing should take you around 6 hours to complete. There are operators in many places on the East coast, you won't be far away from one. As for a twin or single, I hear twins are easier to manouvre on the water, but not sure where you'll find a twin on floats in Oz. If you already have a tail wheel endorsement you'll find the float flying a little easier. Could you PM me with the info you have on Twin Otter float operators? Cheers.
Good luck with it, you'll have a ball.
