Hello, I'm a particular and I usually like to send letters and small things, never more that 2kg to my different friends all over the world, I have been using the normal tracked letters and packages of the post office but it has already happened more than once that they write something wrong or they suddenly tell me it's way more expensive than it should for the weight and size, is there a way I can personally register the letters/small packages as a particular online and idk print a label? Or is there any other type of shipping for small parcels that I can use to send things to my friends?

Can I use your shipping services from the USA to China, Where are the offices here in USA?
I will like to visit a factory there: Sichuan Mayflower Precision Machinery Co.,Ltd.
What Do I need to make a trip.

I would like to know about your services for shipments from china to several countries, I have china suppliers and I want to do dropshiping