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You need a wide open space, preferably a field, with no buildings or trees around.  The number or people in the area should also be limited, as the functioning of an RC helicopter can be extremely dangerous.  The size of the space you'll need will differ depending on the size of your helicopter.  You can either go out by yourself, or go with one other person.  Distractions such as pranks, games, or laughs can dampen your ability to focus on flying your copter. Dogs and other pets should also be left at home.  There are many horror stories where pets are killed by falling aircraft.  Do not let this happen to one of your pets. the area size should be at least 60X60 feet.  The best ground material is clean, smooth pavement, or tightly packed snow. If you are someone who is new to flying, you will need to attach this equipment onto the bottom of your helicopter.  The training equipment is typically two wooden or carbon fiber sticks, crossed in a "T" shape, with little rubber balls on the ends.  These can be purchased at helicopter specialty stores, both online and on site, for around 40-60 dollars. For a good video on how to make your own training gear, visit: https://www.youtube.com/watch?v=CJtNIzZ9U_0. You will need to make sure that your receiver batteries, helicopter, and radio are all charged up before you go out to fly your RC helicopter.  You will also need to check the weather before you go out.  If the weather is anything above 15 mph wind, and/or light rain, you should avoid flying your copter.    You should also bring safety goggles with you when you go out to fly. If you are going to be out in an open field, especially in the fall or winter months, make sure you are wearing warm clothes.
Find a flying site. Purchase or make helicopter training equipment. Check for last minute precautions.