Those questions begs the question - was there space before there was matter? If so, then space could well be infinite. If space was born out of the 'big bang' like physical matter, then you would think that space extended an equal distance to that which matter has travelled and thus space has a boundary. Even so, if some theories are correct (that the universe doesn't have enough matter to result in it's collapse), then space might expand at an ever increasing pace for eternity and thus the universe would 'become' infinite.
Deep space probably contains star clusters and other objects similar to those we observe in this galaxy. When we view deep space, we are looking back in time (the light we receive from a star 1 million light years away is the light that was emitted 1 million years ago and hence we are looking at that star as it was 1 million years ago). If we could get up close to that star and it's surrounding galaxies, I don't think we'd notice anything out of the ordinary. Who knows though?
As for life forms, I believe that there would be some life forms like us, but there are probably more life forms unlike us. The universe is far too large for there to exist a single race and believing that Earth is the only inhabited planet is just another form of arrogant anthropocentrism. I think that we will eventually come into contact with one or more of these life forms, when is another question entirely though.
Most of the information we have regarding those questions follow one or more paradigms which may or may not be right so answering them is more a philosophical experiment rather than a scientific one (for the time being atleast). I'll look out for any information which might be of use to you.
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