Hi Samantha,
If you will have graded activities in "module" courses then you will have to transfer the grades to the "homepage" course manually later, since it is impossible to "combine" the gradebooks.
You can try to review some plugins available ( I have not tried any myself though)
http://moodle.org/mod/data/view.php?d=13&rid=3366
http://moodle.org/mod/data/view.php?d=13&rid=3365
http://moodle.org/mod/data/view.php?d=13&rid=1775
Gradebook
Collate Grade Books
This discussion has been locked so you can no longer reply to it.