Business Visa to china to indian

I would like to Visit xiamen and fuiian as business to tour to visit their factory. it is my first international visit and what i have to do for applying visa and how much cost to stay for one week in china, where I have to exchange my money, shall I use credit card and debit card over there, is it any additional charges will charge by bank if I use indian bank issued international debit card. How much I have to exchange my money after reaching china in exchange