The standard model of the beginning of the Universe does not depend on any preferred or special location in space. In other words, all points in the Universe are equivalent, so there is no particular point that is "the" starting point or center of the Universe.
Our observation that the Universe looks basically the same in all directions (if you take the travel time of light into account) are in agreement with this model.
In this sense, the Universe is similar to the surface of a balloon. If you inflate a balloon, then its surface area increases but there is no particular point on the balloon that is "the" center of the expansion. In fact, the center of the expansion is not on the balloon at all, but rather inside the balloon.
Two-dimensional beings living in the surface of the balloon would be able to deduce that their universe was expanding, even if they can only see along the surface of the balloon, because they would see all other "galaxies" in their universe (dots on the balloon) move away from them, with a speed that increases with distance, just like we see in our Universe.
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