I'm a VBA novice looking for a solution to the following please:

I have a drop down list with 10 different options. Depending on which option is selected I would like today's date to be inserted in a different cell IF that cell is empty. If it's not empty then nothing should happen, the idea being that the date each option was selected will be stored permanently in the relevant cell.
So, to explain if "Briefed" is selected from the drop down list, I'd like the date to appear in cell M4 (if M4 is empty). If "Quoted" is selected from the list I'd like the date to appear in cell N4 (if N4 is empty) and so on and so forth for 10 options on the list.

Being a novice this is way above my head - any help anyone can give me would be hugely appreciated!

Many thanks

Vicky