You could try doing a search for "coursework" and you'll usually get some simple database designs (an example). Create some SQL to insert a single main record and it's supporting data. Then put this in a loop to insert 1000 records.

As you have described it, it doesn't seem like a very well focused assignment. You seem to have equale problems getting hold of a database structure, understanding it and filling it with data - that's before you get to the real coursework of building a data mart. At least one thing you'll learn from this is to give yourself enough time in future