File to IDOC scenario queury

Hi Experts,

My scenario is File to IDOC, do I need to create partner profile (WE20), in PI system?

If yes mine is coustome IDOC, when I'm trying to give the INBOUND mesage type I don't see any message type of my Coustom IDOC, can any once suggest how to assign data type.

In partner profile (WE20), What value I need to given in the Agent

Thanks in Advance and will be rewarded for the inputs.

Thanks

G V Anil