I have used Pos Laju to send something to my Friend In Philippines.

Zhuhai is at Guangdong

you Can refer to Google Map

So i think you Should use Poslaju if you want to Cheapness and to use Fedex and so on if u want Reliability and Security.

As For Sending using Fedex or so on, i think you just have to go to their Center and fill in some forms?

Also if you want even cheaper rates you can Use Pos Daftar but it takes longer to arrive, like 1 week like that... But its very very cheap