Congratulations! You've got a really nice lens!
What Peter said is very true. Primes can become habit forming because they are so much sharper and brighter than just about any zoom lenses. Plus, the lens you received is widely known to be one of the best DX lenses Nikon produces. Also, because the lens is so fast, you'll be able to shoot in much lower light without having to resort to flash.
The downside is that a prime lens is less convenient. In other words, you'll have to do any zooming with your feet. That's not necessarily a bad thing.
I believe that the lens shade can be mounted in reverse when not in use so there's no reason to leave it at home. I would definitely use it during the day. At night, it's a toss up but since it adds so little to the length and weight of the lens, there's really no reason not to leave it on. So, there's no downside to using it all the time.
--Ron