Use of a ComboBox an a form. How would I do this?

I have 2 tables An Employee table with an autonumber EmpID, FirstName, Last
and EmployeeID. The other table LOCKERS contains an autonumber ID, Locker #,
Type (M,F), Key Number. What else do I need in the LOcker table as far as
fields? On a form how do I use a combo or list box to see what lockers are
avalable to assign to an employee. An employee can have more than 1 locker.
When a locker is assigned how do I get it to not appear in the list anymore??
I am pretty new to this and need help that a basic user could use to get me
here, Thanks

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