Most people use a microfiber cloth to clean the screen.
To make folders: Hold an icon until it starts to wiggle (Apple's term). Then, while still holding it, move it until it's over another icon. They will merge (like a amoeba) and a folder will open. You can name this folder whatever you wish.
Once the folder exists, you can add apps to it - up to 20 for the iPad.
Hope this helps.
Marilyn