I strongly suspect Poe, and if so not bad at all!
Edit:
No, I take that back, I now think you're genuine.
Well, where to begin - you seem to have no science grounding at all, so here's a quick summary of the universe:
For some reason, still unknown, there is something rather than nothing, and the something is (or at least includes) our universe.
The nature of the universe is that there is space and time (combined as space-time), and that has expanded from a zero point we can identify as being 14 billion years ago. That's described by Big Bang Theory.
Within the universe is also energy in various forms, and that has formed matter. There are other aspects to the universe, notably forces like gravity and electromagnetism.
Gravity has caused the matter to form in clumps like galaxies, and inside these, more localised clumping forms stars and planets.
Stars go through a life-span, and convert light elements (e.g hydrogen) into heavier ones (e.g helium, carbon, iron, etc). Stars can also eject this material, and it gets 'recycled' to form new stars and planets.
Our Sun is just such a star, and Earth such a planet. It is a small rocky planet compared to some others, and has various materials such as hydrocarbons. The effects of weather and other conditions made the hydrocarbons form self-replicating molecules, later more complex organisms, and this is the basis of life. The process is called abiogenesis, and is still not fully understood.
Once this life got going, it spread and adapted to all sorts of local conditions, resulting in all sorts of organisms. As the Earth environment has been continually changing over time, this has meant that the life has kept changing too. Some species go extinct, other adapt to become new species. Hence the current life is mostly very different from that millions of years ago.
So, humans are just one of those modern species, and are well adapted to the conditions. Our ancestors were other creatures such as earlier primates, earlier mammals a bit like lemurs, and further back, reptiles and fish. All the way back to the earliest microbes, in fact.
In a few million years it could well be that there are no longer humans, but we evolve into other species. That sort of thing is impossible to predict, though, as we can't really predict how conditions will change.
So there was no 'suddenly appearing' from nothing, just a long process of evolution after an initial life-causing process.
Similarly it took billions of years of the universe evolving before our Sun and Earth ever came to exist. All through perfectly natural processes.
However, that's a brief description of many different processes - if you want more detail I suggest you ask about each one.
http://en.wikipedia.org/wiki/Big_Bang
http://en.wikipedia.org/wiki/Formation_and_evolution_of_the_Solar_System
http://en.wikipedia.org/wiki/Abiogenesis
http://en.wikipedia.org/wiki/Evolution