Do not buy a remote controlled petrol helicopter unless dealing with a reputable shop or club. They need expert set up, you need public liability insurance (law!!), and you need guidance on how to fly, they are difficult!

You are wasting your money on anything imported with no return policy, that costs less than £100, it WILL NOT WORK/FLY!! 

Battery powered Conta rotating helicopters, such as perkins medevac, twister bell are great to learn on, but still need to be set up correctly, if bought 2nd hand. You need adequate indoor space, they are only good outside on calm days as their weight is not sufficient to stand up to the slightest wind