Create Entities for Custom Tables for Data Migration

I am migrating data from AX 2009 to D365O and now i have come across the custom tables and I am wondering if anyone could help me out!

Forgive my questions as I am totally new to data migration:

  1. Do we need to create Target Entities, Staging tables? If yes, how and where?
  2. Is there any area where I need to write a piece of code ? Where?
  3. What else i need to do apart from the above queries i have raised?

Thanks in advance !

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