Grid settings in Blenders 2.8

thank you all
I’m in the world of blender
i would like to use directly the new version 2.8
1- any docs to help me to start ?
2- when i open blender the main window was black ,is it oki or not and how i can convert the view from 2d to 3d and show the grid /Grid settings in Blenders ?

Check Blender manual. Most of your questions will be answered when you read through. Good luck!