Code to create a new workbook that also includes code

Hi. I have a macro that creates a new workbook and copies data over to it. I also want this macro to create a macro in the new workbook that is called from a button on one of the worksheets in the new workbook so that ultimately the new workbook will have it's own macro code. I haven't got the faintest idea how to create code in a new workbook with VBA. I actually can't even think how to search for this in the forum or Google. Any guidance to get me started will be greatly appreciated. Thanks all.