A dedicated training is the best way to start development of a Symbian application
NewLC has written a set of french training sessions targeted at developers with little to no experience in Symbian OS:
Introduction to Symbian C++ Development
Beginner 2 or 3 days
Series 60 Application Creation
Beginner 2 or 3 days
Each set of course can be customized to suit your need.
The 3 days course contain a little bit more details and exercises and is preferable
if you never tried Symbian development before.