I'm Code Warrior OEM version user for writing device drivers for symbian. Can any one let me know

Hhow to install device driver on new device(phone) and how to configure the kernel in order to install driver ?

How to connect and configure the phone to the host PC for installing the device driver ?

Do we need to access the Symbian OS Source code for writing new device driver for it ?

I'm very thankful to you if anyone answer these queries.

Thanks & Regards