First off, the Sun is not a big star. It is a Main Sequence star, which means it's an average size star. Second, at the formation of your Solar System, gravity caused rocks to start getting closer together and spinning. Eventually, the friciton and gravity was so great, and became so hot, the spinning rocks became a star, known as the Sun.
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yes it was and still is a big star
a green nebulous star
Planets and stars are not the same. Venus is the closest planet, on average. The sun is the closest star.
Earth is heated by the sun, which is a star.
The center of our solar system is the Sun. The Sun is a star.The nearest star to the Sun is Proxima Centauri, a red dwarf about 4.24 light-years from the Sun.