How to create an alv program

Can any one tell me how to create an alv program,

and can any post a small or some examples,in alv grid.

How to use double click event in table control.

Where can i get an alv material. Means not the theory i need some examples. I have the theory material with me but without any syntax.

how to put name to the push button in the application tool bar when it is created with selection-screen command