I really like this guide, but I have a question= What do I buy, when I want to sell my Doran's Shield?

I build Poppy very much like this and it is absolutely amazing. The core items are exactly the same, the rest depends on how the game is going. I prefer a little bit of defensive stats to go with my offense, but dealing more damage is always good.

Wards, you are partially correct, as your support should be buying wards, but wards are necessary either way. Potions help too, but not always necessary. It just depends on how hard you are stomping face.