Making your macros run automatically when opening your workbook. You can either use the Auto Open method or the Workbook Open method. These macros will display the message "Hello" when you open the workbook.
This code would be located in the module. However if you use the second method, the code must be in the workbook (double click "This Workbook" in the explorer window). Click on the drop down list (that says General) and select Workbook. Click on the drop down list (that says declarations) and select Open.
Private Sub Workbook_Open()