Can my son and i obtain visas to enter china after ariving in hong kong. we are from the uk.

Hello again. we are looking to visit Hong Kong at the begining of august 2015. whilst we are there we would like to visit one of our supliers in Zhongshan for a period of time possibly 1 month. maybe more. we would also like to take the opertunity to visit other manufacturers and suppliers on the mainland whilst we are there.

could you tell me also what the requirements are to move to china permanently for myself and my family. thank you very much
kind regards
mark