Remember to apply for the general visa application for China and USA before you travel. Make sure you have the contact information to our assistance partner.
China: You will need a visa. You will have to fill out an application and give your fingerprint. Also you need an invitation from the company you are going to visit in China with specified information such as name, passport number, dates. You can see more here.
USA: You should apply for "ESTA" if you are a citizen or eligible national of a Visa Waiver Program Country. Your travel needs to be 90 days or less.
You can apply for your ESTA here.