Need Guidance on autopopulating fields in Information Panel and EditForm.aspx

Question

I need some guidance on auto-populating fields in Information Panel and EditForm.aspx.

For example i have a field that is Approver and Approver's Department. I would like to populate the Approver Field with CURRENT LOGIN USER and based on the CURRENT USER, i would like the Approver's Department to populate with department that the Approver is from...


Many Thanks Ahead!