Hello, after I have obtained the Z visa, and Im in China,

with all the required documents from my employer, what is the next step? I need to apply for the work permit, yes? And I will need my original degree? I am concerned about giving China my original degree, so I was wondering, how long will they keep it for? Do they look at it, or hold it for several days? Can I give them a notarized copy instead? Will they need any other original documents? I need to make sure I bring them to China. Thank you.