what is the process and how my wife can come with me? I am applying for a Z visa.

thank you for your reply i got your point tell me please if i want to get my Z type first and then go back to china or after 4 month. i want my wife to come. then what will be the process. it will be the same or diffrent? or that time my presence in Pakistan will be useful or not? if i go to pakistan to take her with me then what kind of ducuments i have to take with me from here?
i am very thankful for you reply :-)