Please Suggest the correct Module

Hi

I am a Mechanical Engg graduate and having 6 years of work experience in automobile industry( Service - Sales & Marketing ). In detail I was responsible fro the After market Quality section. I wish to take a SAP course so that there is value add to my profile.

My queries to the SAP professionals are:

1- Which module is best suited for profile like mine?
2 - Which is the best institute for undergoing training?

Thanks...