I have got job offer and I want to apply for work permit for myself and my family.

You can apply for a work Z type and your family can apply for S1 type.
You need to provide passport and copy of its data page, the application form, a recently-taken passport-style photo, the work permit notification and other documents the consular officers consider necessary.
Your family needs to provide passport and its copy, the application form, a passport-style photo, copy of your work permit, and relationship certificate, as well as an invitation letter from you, and medical examination report.
Afterwards, submit the applications to the embassy of China.