Nice choice. The white dwarf I grew wasn't too stinky and she is a good size AF mine were around 2' when they finished. Here is a link to a grow log here with some nice WDs: http://boards.cannabis.com/grow-log/...ite-dwarf.html
The reason for the air stone is 2 fold. First off the added 02 is always a good thing but more importantly is that sometimes the roots get into the aero's pump system and when that happens it stops circulating the water. Now while the roots are in the bowl/water so that they are being fed the water will grow stagnant and that can kill your whole grow that happened to me with my first grow and I ended up losing all but two in that grow. In the future you can get the aero's refill kit for their seed starter kit ($20 for 75 plugs) they are a little long so they need to be cut down but they work great and no seeds need to be dug out