Beginner - DSLR

I want to buy a DSLR camera. I am new at this, so I've done some researches and found four Nikon cameras: D3200, D5100, D5200 and D90.

Now, I heard something about 'focus motor'; my question is: is it better to have a built in motor in the camera or in the lens.

Considering the lenses, I know there is one for each scenery, but which type is the best in your opinion.

I hope for your advices!  Thank you

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