where to start ?

Hello all,

I'm a C/C++ programmer for some time (about 7/8 years) and recently I modified an framebuffer driver of
an ARM board for a specific project but I'm a newbie kernel programmer, I'm subscried to kernel-janitors
some days ago, now I want to know where the best place to start, there's some index/manual to priority
activities to do (and how to do) ?

Thanks in advance

Flavio Alberto Lopes Soares