You'll have to find your own style before you can really answer those questions. The answer will come naturally as you get deeper in this hobby. I will second A5H, kit lens are the less expensive options to start with and you can use them as prime to see if you like it or not before even spending a penny.
Primes are not more difficult to use, they are just less convenient for some people. Others will never think about using anything else.
I use both zoom and prime lens. My 16-85mm is on when I don't know what I want. But when I'm in the mood to practice my composition, or getting pictures with strong bokeh (blurry background), my 35mm is definitly my favorite choice. They are both usefull.
You'll notice after a while that you tend to create the picture in your mind before shooting. But you have to start somewhere and I don't think you'll be loosing with the 18-105 VR that comes with the kit. It's a nice all-around lens.
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Life is simple: do it, then live the consequenses.
My Flickr
Nikon D300, 35mm f/1.8, 85mm f/1.8, 16-85mm f/3.5-5.6 VR, 70-300mm f/4.5-5.6 VR, SB600
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