excel vba - Fixing my macro to copy a range to the next blank column?

I need to copy a cell range into the next blank column in a separate sheet, every time the forms buttons for the macro is clicked.

Here's the code. The problem is it copies to the next blank row, and I need the next blank column. I have tried editing the line* in various ways and end up with errors, or no effect (e.g. replacing "Rows" with "Columns").

• Cells(Rows.Count, 1).End(xlUp).Offset(1, 0)

If found the base for the 'copy to next blank row VBA' here at SO, at the following link:
Copy and Paste a set range in the next empty row

Thanks for any help, I'm stuck currently.

Sub TestCopyToDB()

    Application.ScreenUpdating = False
    Dim copySheet As Worksheet
    Dim pasteSheet As Worksheet

    Set copySheet = Worksheets("sheet1")

    Set pasteSheet = Worksheets("sheet2")

    copySheet.Range("M1:M15").Copy
    pasteSheet.Cells(Rows.Count, 1).End(xlUp).Offset(1, 0).PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
        :=False, Transpose:=False
    Application.CutCopyMode = False
    Application.ScreenUpdating = True

End Sub

Answer

The Cells method has two arguments, row and column, i.e.,

Cells(1,1)   '<~~ equivalent to cell "A1"
Cells(1,3)   '<~~ equivalent to cell "C1"
Cells(10,13) '<~~ equivalent to cell "M10"

The Offset method works similarly, with two arguments, row_offset, and column_offset, so:

.Offset(1,1)   '<~~ returns the cell one row below, and one column to the right
.Offset(-1, 3) '<~~ returns the cell one row above, and 3 columns to the right

Making some adjustments, and change the .End(xlUp) (for rows) to .End(xlToLeft), gives this:

With pasteSheet
    .Cells(1, .Columns.Count).End(xlToLeft).Offset(0,1).PasteSpecial _
        Paste:=xlPasteValues, Operation:=xlNone, _
        SkipBlanks:=False, Transpose:=False

End With