Nikon D3200 White balance?

So I'm a complete beginner with DSLR cameras and wanted to try time-lapse photography. I have a Nikon D3200 and wanted to try some simple time-lapse of clouds to start out. I know the auto focus should be off, and use manual mode. Im somewhat familiar with the manual settings (iso, shutter speed, ext) and the 24-30 fps for smooth time lapses.

My main question is how to turn off the auto white balance? If i set the camera to manual mode does that automatically lock the white balance? There doesn't seem to be an "off" setting for white balance it just lets you choose between different scene modes (clouds, incandescent, ext.)

Also any good tips for shooting cloud time-lapse or any other scenes?

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What is single auto focus and full time auto focus?

i was just messing with camera setting (nikon s5200) and found these two options. First tell me what is the difference b/w them? And then tell me which should be used and when should be used!
and also tell me the meaning of these two option in video mode, will it autofocus during video shoot?

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