Trouble in design 3d!!!!!!!!!!!!!!!!!

 From:  aris (ARIS89)
Hi to all! I am new in 3d design and I try to learn MoI, but i cannot manage it very well. I want to make a 3d computer (screen, tower, keyboard and mouse). I don't know how to make it. It seems very difficult to me. How can i find a ready 3d same model to understand how it is designed? Could anyone give me a .3dm file with a 3d computer? Thanks a lot.