Infinity into Infinity

How does one understand in a functional way the concept of infinity. A friend and I have discussed this at great length. Its not an easy question to answer! One must leave classical mathematics behind, along with newtonian physics. Infinity can only be found in the land of zero. Where 0 - 0 = 0, 0 + 0 = 0, 0 x 0 = 0, 0 / 0 = 0, this is an almost useless bit of mathematical jargon here in our realm. But it means more than one might assume. Zero means more than "nothing" it also means "everything" and it also means "infinity." Infinity fits into infinity! Thus you can have an infinite number of worlds within an infinite omniverse. You could even have an infinite number of "twin universes" within an infinite omniverse. Think about that last comment for a moment... it's not possible by our logic is it??? It's possible because another form of logic controls that side of the mirror, so to speak. We live on one side, and we understand as a "flatlander" would. We know in part. But we are just smart enough to know that what we are observing hints at something much much greater. Understanding this, is key in digesting the greater concepts of MWI and MMT.