International transfer at Beijing Capital Airport

I will be arriving at PEK by air china from Mumbai (india) i.e international arrival and need to proceed to Incheon, south korea (international departure) by air china. I have lay over time two hours only. What are the transfer formalities with regard to luggage, immigration etc.,? Also i have visa for south korea; is it required to have visa for china too for the above mentioned trip as I am passing through china?