You must have "instructions, instructions, claims, drawings" to declare in China National Intellectual Property Administration. China National Intellectual Property Administration's website has a declaration guide. You can download more patent materials, read them and learn how to write them. I suggest you find a professional agency. You can find such an agency in the local intellectual property office. I applied for a patent myself and did a lot of preparatory work in the early stage, but considering the safety, I finally chose to find an agency.
The success rate of applying for an agent is relatively high, and the agents can basically pass the examination and approval.