Product Sample and Mass Manufacturing and Assembly in China

I have my product manufacturing blueprints ready. I need help in manufacturing a sample product from China, then once approved, find a cost-effective mass production partner. Your role will be assisting in finding this partner from China. My product is composed of an enclosure and electronic components embedded onto a main PCB. More details can be shared after getting awarded the project. My main appeal is to be as cost-effective as possible as all the work has been technically completed and your task will be managing the communication with the Chinese factories.