Who invent word 'Black-Hole'?, and why this name?

According to http://www.bowdoin.edu/dept/physics/astro.1998/astro09/index.html Roy Wheeler first used the term in 1968.

Why this name? Things fall into holes. Think of the gravity around a Black Hole as a large well with increasingy steep sides. Once you pass a certain point, you will fall into the well and never get out. That point is called the Event Horizon and where the sides of the well are so steep not even light can escape. A better way of putting this is that spacetime is so highly curved light bends back on itself. This means light can not escape out of a Black Hole - its Black and a Hole

In which direction, north-south-east-west-up-down, that Big-Bang, happens?

Hold onto your hat, the Big Bang happened everywhere. At least that is current thought. The Big Bang did not create matter that expanded into space it created space, time and matter. When we say the Universe is expanding it means literally that space is expanding - the distance between two points is getting larger.

N.B. Before someone bitches about simple answers, I am fully cognizant of co-moving coordinates and the Robertson-Walker, Kerr, Schwarschild metrics. I think that could be a bit too complex here.

And which point at earth i take this point-direction?

There is no one point, the Universe does not have a `Center'.

Yelmalio - Who thinks Trolls live in Black Holes.