There are many different ways to learn Chinese in China, depending on your preferences. Most commonly, teachers choose to find a personal tutor, which can run about 30-100RMB (10RMB = 1 pound, 6RMB=1 dollar) for 1 hour.
English is not spoken as much in China as it is in South America or Europe. However, that doesn’t mean you need to speak Chinese to survive in China. Most people will understand simple phrases and you can usually get your meaning across with some hand gestures and patience. There are also many restaurants with English or picture menus and most major businesses will have a token employee who can speak English.