Excel VBA Columns in chart - format font, color, alignment etc

I am having troubles formatting columns in a chart to match a specific font, colour, alignment etc.

This code, while focused on column A:A, it applies to every single cell in the worksheet. I only want it to affect Column A:

Sub PGMNumber()
'
' PGMNumber Macro
'

'
    Range("A:A").Select
    With Selection.Font
        .Name = "Arial"
        .Size = 10
        .Strikethrough = False
        .Superscript = False
        .Subscript = False
        .OutlineFont = False
        .Shadow = False
        .Underline = xlUnderlineStyleNone
        .Color = -16776961
        .TintAndShade = 0
        .ThemeFont = xlThemeFontNone
    End With
    With Selection.Font
        .Name = "Arial"
        .Size = 10
        .Strikethrough = False
        .Superscript = False
        .Subscript = False
        .OutlineFont = False
        .Shadow = False
        .Underline = xlUnderlineStyleNone
        .Color = -16776961
        .TintAndShade = 0
        .ThemeFont = xlThemeFontNone
    End With
    Selection.Font.Bold = False
    Selection.Font.Bold = True
    With Selection.Font
        .Color = -10477568
        .TintAndShade = 0
    End With
    With Selection
        .HorizontalAlignment = xlLeft
        .VerticalAlignment = xlBottom
        .WrapText = False
        .Orientation = 0
        .AddIndent = False
        .IndentLevel = 0
        .ShrinkToFit = False
        .ReadingOrder = xlContext
        .MergeCells = False
    End With
    Columns("A:A").ColumnWidth = 9.43
End Sub

This was done by recording my steps. All I need is FontName, Colour, Bold, Size and Alignment. Deleting what I don't need breaks the code :(

Can someone help me simplify the code so it will only affect column A?

Also, how do I add the option to include other columns, for example B, C, D, etc.

Lastly, can I have the macro start formatting from A6 downward, B6 downward, C6 downward, etc? That way the header of the chart remains untouched.

Thank you!