Sending data to a different workbook

[Kevin]

Even though I'm pretty new at Visual Basic and basically
just cut and pasted a lot from different internet sites, I
think my form's pretty close to working. I can get it to
write to a different workbook, or write on the next blank
line in the same workbook, but I'm struggling trying to
figure out how to take data from the fields and put them
into the next empty row in a different workbook. So far I
have:

Private Sub btnSubmit_Click()
Dim appExcel As Excel.Application
Dim LastRow As Object
Set appExcel = New Excel.Application
appExcel.DisplayAlerts = False
appExcel.Visible = False
appExcel.ScreenUpdating = False
appExcel.Workbooks.Open FileName:="C:\my
documents\Sales Rep leads\Master List.xls"
appExcel.Worksheets("List").Select
*******appExcel.Range("a65536").End (xlUp)*******
appExcel.Offset(1, 0).Value = txtContactName.Text
appExcel.Offset(1, 1).Value = txtLocation.Text
appExcel.Offset(1, 2).Value = txtCompanyName.Text
appExcel.Offset(1, 3).Value = txtCity.Text
appExcel.Offset(1, 4).Value = txtState.Text
appExcel.Offset(1, 5).Value = txtPhoneNumber.Text
appExcel.Offset(1, 6).Value = txtContactName.Text
appExcel.Offset(1, 7).Value = txtNotes.Text
appExcel.ActiveWorkbook.Close Savechanges:=True
appExcel.Quit
Set appExcel = Nothing
Unload Me
End Sub


I'm pretty confident that my problem is in the line with
the astericks, but I'm not exactly sure how to fix it.
Like I said, this is a lot of cutting and pasting, but I
do want to learn so whatever you could explain to me (both
how to fix it and what it is that I've actually done in
this whole program), would be greatly appreciated. Thanks.