Run the stud finder across the wall. Make a pencil mark on the wall everywhere the light on your stud finder comes on to mark the beginning of each stud. Make another mark every time the indicator light goes off to mark the opposite end of each stud.
Hold your level horizontally against the wall. Move the ends of the level up and down to place the bubble in your level between the marks on the plastic tube. Draw a pencil line across the wall to mark the top of your brackets.
Place a shelf bracket vertically against the wall. Line up the bracket between the marks indicating one stud. Hold your level against the side of the bracket to line it up evenly. Attach the bracket to the wall by driving a drywall screw through the bracket and into the wall every 8 inches along the length of the bracket. Fasten a bracket to each stud along the length of the shelves.
Slide a shelf hanger into the same level in each bracket. Lay your level onto the hangers to ensure a flat surface. Place a shelf onto each set of hangers and add your belongings.