Big Bang: Well there was this infinite heavy and super small black hole type of thing that exploded. This was apparently not infinite small; Everything was in there; It is now just expanded over a long distance. Balance is in the everything, ie on Universe level :)
Beginning/End, or not: Before the Big Bang there maybe was another big bang and universe implossion. There you could see balance again.
Matter: There is this theory that matter cannot exists without anti-matter. Although we have difficulties to create anti-matter and store it, doesnt mean it is not somewhere in the universe. We need the dark matter in the universe anyway, that large percentage of matter we cannot see/detect, for the big bang theory to work.
I like a theory called "the holographic universe". That theory basically tells us that matter does not exist, that we are all one, that anything that is different (eg earth, human, table, chair) is a glitch, an impurity, in a homogenous 'fabric' of energy.
Don't even know what I'm talking about here, just some brain fart ;)
LOL, on this side it is not much better :)