I think I need to create a loop Macro to do this, but i'm not sure...

Here's the situation:

I have a cell (D8) that contains a drop down box of about 20 unique codes.
When the code is selected it auto-formulates all the necessary information on
the next sheet over (Check Request Sheet).

What I need to be able to do is have a Macro that when I run it, it
automatically goes through and selects each code from the drop down box and
then prints what is on the Check Request Sheet and then goes to the next code
and does the same.

I already have all the formulas and such written to auto-format the Check
Request Sheet. I just need to know how to create a macro that would allow
for the selecting and printing repeating cycle. I was thinking maybe a loop
macro, but I'm not really sure, I'm still trying to read about them to better
understand what they do.

Thanks,

Steve