Think about it, if your invention really has practical potential, I suggest you find an agency to do it, or spend more time studying how to write the application documents yourself.
If you want to know whether it meets the standards, you need to have a basic understanding of the requirements of the application documents. I suggest you go to China National Intellectual Property Administration website to see the relevant requirements, study the patent examination guide and look at the first and second parts.
If you really have financial difficulties, write it yourself. If you want to write it well, there is no shortcut. Learn more review guides, look at what others have written and imitate it ~