Populate Table With Stored Proc

I am looking to populate a Schedule table with information from two
other tables. I am able to populate it row by row, but I have created
tables that should provide all necessary information for me to be
able
to automatically populate a "generic" schedule for a few weeks or
more
at a time.

The schedule table contains:
(pk) schedule_id, start_datetime, end_datetime, shift_employee,
shift_position


A DaysOff table contains:
(pk) emp_id, dayoff_1, dayoff_2 <-- the days off are entered in day
of
week (1-7) form


A CalendarDays table contains:
(pk) date, calendar_dow <-- dow contains the day of week number (as
above) for each day until 2010.


My main question is how to put all of this information together and
have SQL populate the rows with data based on days off, for a few
weeks in advance. Any
suggestions?