How to apply for a utility model patent? What materials and certificates are needed?

To apply for a patent for utility model, the application documents shall include: the request for a patent for utility model, the abstract of the specification and its drawings, the claims, the specification and its drawings.

According to the patent law, the application for a patent for utility model does not go through early publication and substantive examination, but only has three stages: acceptance, preliminary examination and authorization. ?

The flow chart of utility model patent application and examination is as follows: