When customizing plush toys from a Chinese factory, there are several key points to consider to ensure a smooth production process and product quality that meets expectations:

1. **Clarify Requirements and Specifications**: Before production begins, specify your product requirements, including size, color, material, filling, accessories, etc. Providing detailed design drawings or samples can help the factory better understand your needs.
2. **Choose the Right Factory**: Select a factory with a good reputation and extensive experience. You can find suitable manufacturers through trade shows, online platforms, or industry associations. Check the factory's production capacity, quality control, and past customer reviews.
3. **Sample Confirmation**: Request a sample from the factory before mass production. Carefully inspect the quality of the sample to ensure it meets all your requirements. If necessary, request modifications until you are satisfied.

4. **Price and Payment Terms**: Negotiate the price with the factory and clarify the payment terms. Typically, custom products require a partial deposit, with the remaining payment made after product delivery.
5. **Production Time and Logistics**: Understand the factory's production cycle and plan the logistics accordingly. Ensure there is enough time for production, quality inspection, and transportation.
6. **Quality Control and Inspection**: Discuss and determine quality standards and inspection procedures. You may want to conduct third-party inspections to ensure the product meets safety standards and quality requirements.

7. **Intellectual Property Protection**: If your design is original, ensure that you sign a confidentiality agreement with the factory and discuss measures to protect intellectual property.
8. **Communication and Feedback**: Maintain good communication with the factory and provide timely feedback and problem-solving.
9. **Compliance and Certification**: Understand the compliance and certification requirements for exporting products to your target market, such as CE marking, ASTM certification, etc.
10. **Contract and Terms**: Make sure all terms and conditions are listed in the contract, including delivery time, quality standards, and liability for breach of contract.

Following these steps can help you customize plush toys from a Chinese factory, ensuring the products meet quality standards and market demand.