My son and myself are traveling to International Culture and Martial Arts school in Jiaozuo City.

we will be leaving California and flying into Beijing and then to Shanghai and from there by train to Zhengzhou where will be picked up to go to the school. I believe we need to apply in Los Angeles. We will be there for about 30 days. My questions are:
1. Is there a service that can be used to submit and pick up documents?
2. Will going from Beijing to zhengzhou and not go to Shanghai, create a problem?
3. How many entries would we need?

thank you