1) Add a plane mesh 2) Select plane in edit mode, right-click, subdivide 3) Increase number of cuts in bottom left subdivide pop-up 4) Select plane, object mode, physics, cloth 5) Set cloth physics quality steps to 10 6) Under collision, set quality to 5 and check "self collision" 7) Select objects for cloth to fall on, physics, add collision 8) Under the cloth physics -> cache, press bake 9) Click on plane, and add/adjust Subdivision Surface modifier 10) Add solidify modifier to give the sheet some thickness