For all we know this Universe is a closed system. Until we get better data, all we know is that this Universe exists alone. Thus, all matter and energy contained within this Universe is all there is. Because of that, because nothing can come in or go out, this Universe is destined to die a long and slow heat death.
As far as right conditions, it does't take too much once a planetary system has formed for the process of coalescence into abiogenetic life to take over. Gravity and matter are all you need for solar systems. A few organic compounds, which are formed in the bellies of collapsing stars are all that is needed for life to form on those planets... The early atmosphere of Earth was a strange mixture of Methane, Ammonia, some Oxygen, and just incredible amounts of Carbon Dioxide. (Just look at Venus...) From that early soup, life as we know it would not do very well. But, thankfully, life as we know it isn't what formed in that nasty mix. It started with a few amino acids (proteins) and then replicated itself in all sorts of weird ways, including producing Adenine, which is one of the bases of RNA. A few lucky breaks later we had Cytosine, Guanine, and Uracil, forming a complete RNA strand. From there, the rest is history... You are alive because some stuff that was not alive was able to bond chemically in a nasty soup of death. Simple mono-cellular organisms eventually produced multi-celled organisms which eventually produced more and more multi-celled organisms until your parents were born.
That's it. It's simple. It's dirty. It's elegant. It's beautiful and it's how you and I came to be.