Hi,
Have you decided which Data Migration Method (BDC, LSMW, BAPI).
For BDC and BAPI: You may take the help from ABAP team member.
LSMW: Please search thru the SDN, there are plenty of the help documents avaiable (One of such is LSMW for Functional Consultants in simple step-by-step way
Hope it helps!
Thank you and Regards,
Varshal Kachole