can you tell me the process of applying for a work visa?

Merry, are you still in China? If so, you need to apply for a work permit first. The kindergarten can help you acquire this. You are required to provide your diploma, working experience and contract. If the kindergarten applied Z type for their staff before, they know what they should prepare. After getting the work permit, yon can try to apply from the local entry and exit management bureau. If they ask you to apply abroad, then I am afraid you should go back to Pakistan to apply.