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Molly bolts are the strongest of your options, holding up to 100 pounds (45 kg) in straight drywall. A molly consists of a screw and a sleeve. The sleeve flays out against the backside of drywall to create a wide base of support. You will need a drill to install a molly bolt. Attach the bit that matches the size of your molly bolt. Remember that molly bolts create large holes in your wall, so choose your placement carefully. If you are using 2 molly bolts, predetermine how far apart you need them to be according to the size of your item. Use a tape measure to make the two marks the correct distance apart. Double check that the 2 marks are in line either using a leveler or by measuring down from the ceiling.  If the item you’ll be hanging has a wire hanger on the back, be sure to consider the length of the slack. You can test this by pulling the center of the wire tight toward the top of your object. Measure from the bottom of the object to where the wire catches. Keep the bit perpendicular to the floor. Use the same size bit as the bolt. For example, if you chose a 1⁄4 inch (6.4 mm) bolt, use a 1⁄4 inch (6.4 mm) bit. Place the molly bolt, the screw and the sleeve together, into the hole you’ve drilled. Some drywall flakes are normal and can just be brushed off the wall. Use your drill or a screwdriver to screw the molly bolt flush into the wall. As you screw, the sleeve spreads behind the wall and you will feel it tighten. If what you are hanging requires brackets, remove the screw by turning it to the left. The sleeve will stay in place. Place the screw through the bracket and screw it back into place. Line your item’s hanging hardware up to the molly bolt and fasten them together. If you find that there is not enough space to accommodate the hanging hardware, loosen the screw slightly.

Summary:
Choose molly bolts for heavy items up to 100 pounds (45 kg). Mark the spot where you plan to hang the object. Drill a hole for the molly bolt. Insert the molly bolt into the hole. Screw the bolt down tight. Hang your item.