Don’t know how to start

Mostly I need help with the second part. I was infact trying to do this using an orchestration but honestly I don’t know how the process would go, what shapes to use. Do I somehow load ID’s from database using one port and then load the flatfile using another port, then using some kind of map i crease the result i need and then using a send port I insert the records? how would it go, can you give a more detail if possible. Thanks