When filing I-130 and I-485 concurrently do I need to duplicate all biographical documents? In other words : am I to provide

Generally, just once. Immigration applications may look simple, but even with the better online help and instructions provided by the goverment, filing is not just filing out forms. Many applicants do fine without an attorey, and many applicants really have problems because they tried it themselves--sometimes creating problems that can't be fixed. At a minimum, paperwork errors will slow down consideration of your case, at worst, you could end up out of status or risking being referred to removal proceedings. Be safe--see a lawyer first.

I agree with my colleagues. You should retain an experienced immigration lawyer, whether myself or one of my colleagues, to review all the facts, advise you, and handle the case.