Inquiry about Kids Birthday Party Sets

I am looking for a reliable manufacturer to produce high-quality kids birthday party sets based on my concepts and requirements. These should be complete themed sets, including items such as children's tents, cushions, blankets, decorative elements, lights, and coordinated accessories.  

Requirements include consistent high-end quality suitable for a premium brand, ability to produce different styles and themes (e.g., boho, princess, modern), customization options for colors, fabrics, and details, and long-term cooperation with stable production capacity. Manufacturing only, no revenue sharing.