I can't really tell from the pic, but is that the whole dwc kit? Is it a bubbling bucket? Like with no pumps/resevoirs?

I ask because I'm wanting to build a similar dwc setup. I feel like it's the simplest(cheapest too) way of delving into the world of hydroponics. This way you don't have to mess with anything but an air pump and some air stones.

Whichever fert you decide make sure you get measuring devices. You'll also need a ppm meter and a ph meter, along with ph up/down.

I've heard using General Hydroponics 3 part micro/veg/bloom is pretty easy. Never used it myself, though.

Good luck.

edit: definitely keep a log too, with hydro there is too much to keep track of without writing it down. Notebooks are like 79cents and in the long run it will help a lot.