Understanding the theory of an expanding Universe How did Edwin Hubble determine the Universe was expanding?

Was he looking in a particular direction?

And where does this Galaxy sit in the expansion.
Hubble discovered that he could measure the approximate distance to some galaxies by observing a type of variable star. The absolute brightness of these stars is known, so by measuring their apparent brightness Hubble could find how far away a galaxy was. 

It was also discovered that most galaxies were "red-shifted", which was interpreted as meaning that the other galaxies were moving away from the Milkyway. Hubble plotted a scatter graph with distance on one axis and speed on the other, and noted that the more distant galaxies were moving faster, and the relationship was approximately a straight line. This meant that all galaxies were moving away from all other galaxies. 

This expansion could be predicted by general relativity, which allowed for  the space between galaxies to expand. It also suggests that the galaxies were closer together in the past, suggesting that the early universe was hot and dense.

The Milkyway does not have a special position in this expansion, all galaxies are moving away from each other. There is no implication that the Milkyway is central to the universe.