Here's the deck: http://deckbox.org/sets/356756

Hi, I bought my first set of cards the other day (deck builder's toolkit & depths of power intro deck), and I've tried to make a blue-black control deck.
I've identified that my mana curve in this deck is a bit screwed up; what's a good way of fixing this? I'm thinking maybe I need some lands which supply either black or blue rather than just one.
So how did I do on a first try? What should I do to make this deck better? Are there any glaringly obvious problems?