Using your Sub250 65mm Micro Drone is a breeze. First, make sure to charge the battery properly (the Sub250 300mAh battery is not included). Then, connect the drone to your controller and perform a pre - flight check. Once everything is set, take it outside to an open area and start flying. Remember to keep it within your line of sight at all times. When it comes to maintenance, after each flight, check the propellers for any damage and clean the drone gently. Store it in a cool, dry place to avoid any potential damage. Also, make sure to update the Betaflight firmware regularly to keep your drone performing at its best.