I think both questions can be answered.

Where is the "center"? Imagine the hull of a rubber balloon. Every point on that hull moves away from every other point when the balloon inflates. Yet there is no "center point" on the hull - all points are equal. It's the same way in the universe, just in three dimensions. Its a consequence of general relativity theory that the universe doesn't have a center or a border.

As to the information amount: The information amount in the universe is finite, even if the universe is infinite. This is a surprising result from quantum theory. From any point of view the universe is split into Hubble volumes that can not exchange information due to the finite speed of light. Every such Hubble volume has a very high but finite number of quantum states, like 10 ^ 10 ^ 100. The quantum states represent the whole information in the volume. Logically, if you have more than 10 ^ 10 ^ 100 Hubble volumes in the universe, some of them must have exactly the same quantum states - they are exact copies of each other and thus do not add to the information amount of the universe.

As a consequence of this, it's almost certain that the earth, this forum, and yourself exist in infinite many copies in the universe.

If interested, read -> http://www.hep.upenn.edu/~max/multiverse.pdf