Im trying to get into hammer , the HL2 engine world tool .
But when i do the tutorial i follow it but i cant see any textures in the 3D world mode... so when i inestert a texture i cant see it in the 3D world quarter... I cant see things like weapons either , on the tutorial u can see the weapons and ammo boxes in the 3d world , i just get a frame. Please help

In one of the menu bars on the top (I think it's view...but this is off the top of my head) there will be options for "wireframe", "solid colour" and "textured" for the 3D view. The default is wireframe...so just change it to textured.

Try this:

http://img.photobucket.com/albums/v364/Maxey/hammer.jpg

It's from Hammer 3.5, but should work in Hammer 4.0 as well.