Please use a smaller file size next time. Great first picture, in focus, and sharp. A little underexposed but overall a great practice shot.Congrats on the purchase, wish i could have bought the lens I picked up yesterday for that price. Much more but then again when you buy Pro level stuff you pay pro level prices. (For those interested it was a Nikon 300mm F2.8D II)
As for learning to use it, practice makes perfect. As well, you can also check out dpreview.com there is a couple of forums there that could help you out.