After I left the house and go into the 3D mode for the first time, the game seems to not load all the Textures, the World is Pitchblack except for some Objects that get loaded if I stand in front of them, don't know how to fix that,

I realize this is over a year old but maybe it helps others with this "issue".. It's supposed to be like that, you are in a dark cellar and have to light a torch.

That depends what you mean with "left the house".

Did you enter the cellar of the building in which you woke up after the shuttle crashed? If so you have to light a torch as the other poster already suggested as it is dark in a cellar.

If you have spoken to the Clan leader and received the Clan Key and left the house through the door then it depends if it is night or day. At night it is dark outside. To know the time you have to retrieve the watch from the remains of your shuttle in the cellar of the building.