Question

what gives the earth its spinning movement?

Answer 1

"The Earth spins because it formed in the accretion disk of a cloud of hydrogen that collapsed down from mutual gravity and needed to conserve its angular momentum. It continues to spin because of inertia."

See link: http://www.universetoday.com/14491/why-does-the-earth-rotate/

Answer 2

Is there a sort of related point here as to perhaps why the solar system is more or less all in one plane - angular momentum conservation ?

Answer 3

@sunnnystrong The standard giant-impact hypothesis suggests a Mars-sized body called Theia impacted Earth, creating a large debris ring around Earth, which then accreted to form the Moon. This collision also resulted in the 23.5° tilted axis of the earth, thus causing the seasons.

https://www.nasa.gov/topics/solarsystem/features/moon_formation.html

I think a more complete explanation would include a mention of the 23.5° tilted axis of the earth and how that occurred. It seems this angle is an important component of the spin.