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even comprehending the simple things in Astrophysics - like 'Hubble's Constant'. If it is a constant, then why does it vary?
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Fair point. This is why it is often and more correctly referred to as the Hubble parameter, I think the term "constant" is more of an historical term. Hubble basically discovered that the universe was expanding, and determined a rate of expansion. The theories that determined its "variability" came later.
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If I can go back a point, i think the idea is that E=mc2 constraining the speed of the expansion is fine for our space-time as we know it
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The speed of light restriction is a Special Relativistic "law" governing the movement of matter through space. It has nothing to do with the expansion if space itself, which is basically the geometry of space as described by General Relativity.
As far as what the universe is expanding into, it's really a philosophical question. If the universe is infinite, which I think current theory suggests, then there is no boundary. If it is finite, then the fact that we are confined to and can never see beyond the boundary means we will never know. It's an unanswerable question.