Worksheet Change Event :: Trying To Set The IntRMACol Variable

This is the code on the Worsheet Change event.


Private Sub Worksheet_Change(ByVal Target As Range)

'Define the RMAs range and count the RMA ships. Do the rest of the math based on this calculation.
Dim intRMACol As Integer, EndRow As Integer, intRMAShips As Integer, LastCol As Integer
Dim rngRMAs As Range, rngHome As Range, sht As Worksheet
Set sht = ActiveWorkbook.ActiveSheet
Set rngHome = Cells(1, 1)
rngHome.Activate
EndRow = Range("A" & Rows.Count).End(xlUp).Row
intRMACol = Cells.Find(What:="RMA#", After:=[A1], SearchOrder:=xlByColumns, SearchDirection:=xlNext).Column
Set rngRMAs = rngHome.Offset(1, intRMACol - 1).Resize(EndRow, 1)
rngRMAs.Name = "RMAs"
rngHome.Offset(1, LastCol + 1).Formula = "=COUNTA(RMAs)"
intRMAShips = rngHome.Offset(1, LastCol + 1).Value
rngHome.Offset(1, LastCol).Formula = "=SUM((" & EndRow & " - 1) - " & intRMAShips & ")"
rngHome.Offset(1, LastCol + 2).FormulaR1C1 = "=SUM(RC[-2] : RC[-1])"
End Sub

I keep getting stuck when trying to set the intRMACol variable. I have used the code all over the place, but only in Modules, never on a worksheet event. EndRow, the variable right above, sets correctly so I don't get it.

Also, do I have to define the Target variable? Am I going about this the right way? I basically want three formulas to calculate when any change is made on the worksheet.