Pls help me!!!!

Hi Members,
I done my M.B.A in Sales and Distribution. I am specialist

in it. But I am working in Logistics for the past 10 yrs. So now I am interested to learn SAP to build my career. So I am in

a confusion to learn SD module or BW module. Pls help me. Also I am a chennai person. Help me to choose the best place for

joining SAP course. Its urgent pls favour me....