Code For Parameter Form

I currently have a parameter form named "Fm_Commander_Parameter" and a report named "Rpt_Bldgs_by_Commander". On the parameter form I have a unbound drop down. On the After Update have I this code that opens the report.

Private Sub Cmb_Commander_AfterUpdate()
DoCmd.OpenReport "Rpt_Bldgs_by_Commander", acViewPreview
DoCmd.Close acForm, "Fm_Commander_Parameter"
End Sub

In the Query for the report for the Commander field I have the parameter as [Forms]![Fm_Commander_Parameter]![Cmb_Commander]..how to write code very well and am unsure this can be done, but what I would like to do is remove the 'After Update' on the form and on 'Open' of the report I would like to write a code to go to the form, allow them to select the commander, then go back to the report query with the selection. This way I could use the Parameter Form with other reports. Below is the code I've come up with that will be place in 'Open' on the report.

Private Sub Report_Open(Cancel As Integer)
DoCmd.OpenForm "Fm_Commander_Parameter", acNormal
(I don't know what to enter to keep the form open to enter the data. Without the below command it will run the report but the parameter form stays open.)
DoCmd.Close acForm, "Fm_Commander_Parameter"
End Sub