First of all, you must search and compare online and choose a brand.

Then, it is best to visit the company's factories on the spot, so as to prevent some companies from saying on the Internet that they set up their own factories, but in fact they are processing on their behalf.

Secondly, after the inspection, you can sign the contract as long as you feel that the company's functions are in line with expectations. The contents of the contract must be audited by professionals to avoid unexpected problems.