please to build the game for android do i need to install any sdk or any thing
No SDK needed, just the editor.
Yes, but there is one small thing (which I stumbled across) to note. If you create an empty project from the mobile template, and then delete everything in the assets folder, you will not able to bundle your app. You will need to change/remove the links to the icon in your game.project
tnx sorry for not repleying for your help respond