Let me take a stab at it.
BTW, and I am not a big bang believer. I am about growth.
Imagine a darkness and in that darkness, within a certain distance there is nothing. Does that mean that nothing will ever go there? No
All things have a centre of gravity and fall under the laws of attraction.
Imagine a particle, 10 Trillion squared light years away, then imagine another particle the same distance in the other direction. The math suggests that 1000 squared trillion light years of nothingness between the two particles. That space that has nothing has to be definable. The space you have selected has to have distance perimeters. The inside of an empty cube or ball kind of thing. There has to be a measurement of nothing in reference to how far you are willing to think of your model.
So for all intents and purposes, your model is filled with total nothingness. Then, 2 particles enter your model from outside your boundaries of you empty model.
Then it is simple physics. The two particles come together. Not in an explosion, but in a unity. This newer, larger particle, then attracts other particles from outside your model to create a larger particle and so on. Then, in the right conditions, and what the new particles "bring to the table", a cell is formed. In my book (unpublished, but working on it), I call it the "Original Cell". (I know, nothing original about it, but I had to call it something)
So, in conclusion, if you are talking about where and how did things come about, they you have to think of space in a series of smaller "blocks". Where the original particles came from, I am still working on.
Its a much simpler way to explain it in reference to a house being built. Before the house, there was nothing. Then, a foundation had to be put in, the the walls and roof. Rooms added and so on. After time a house is where there was nothing to start with.
I hope this gives you something to think about.
