I am trying to create a macro that will do the following

Create a new colum
Label the new column with today's day (Mon) in cell C1
Label the same column with today's date (05/17/04) in cell C2
Copy and paste what is in column A3:A50 & B3:B50 into C3:C50 & D3:D50
Copy and paste values what is cells A3:A50 & B3:B50 into those same cells

The problem I am running into is

Each time I run this macro I don't want it to overwrite the old data. For the next time I ran the macro I would want the new information posted to cells E3:E50 & F3:F50

I appreciate the help
Thanks.