im from south africa how much is a return plane ticket to beijing?

Um, the flight ticket always changes, so I can’t tell you the fixed price. But you can search for the detail for your travel date on the flight page of this website.

For accommodation, I recommend Hilton Hotel and Marriott Hotel City Wall. Both of them have official website in English version. You can just book online. Or you can just book through TravelChinaGuide. I know their email address is: bookingtravelchinaguide.com