1) how to make invisable wall?
Use player clip texture (You can find it in common textures foldzer)
2)how to make water with water sounds?
Easiest way to make water is making shader that you can go tought. code of this type wall and how to add sound you can find on GZmap Forums.
3) how to make like a flag that moves like the one in mansion?
Flags are elu + ani objects with animations you can only replace those objects from manion to your map but you cant change its place. (Flag object adding is same as sky adding)
4) how to make Circles?!?!?
Brush >> Prism...
5) how I can wall like door only screen that if i walk on it i can go throught it like its only pic that i can go other side...
Its shader wall. (It was released on GZmap Forums.
6)when i try to Build with Light Map it opens the build cmd under the LightMap Generator says LightMap generation failed!
and I go test the map on the game with lightmap it auto crash the game... how i can fix this? T.T
I cant realy say why but I guess that your map is overloaded witth brushes. How much brushes it has. I had this error once myself when I added too much circles.
7) Sorry for alot of Questions im newb Map maker =[
its ok 