Drop Down Problems

We finally got everything to work together and enter into our database from the internet.  This was a huge step, and we have successfully implemented it into 3 different tables.  However, as we tried to make the forms look a little more professional and easier to use we had a lot of trouble with the drop down menu.  We have been successful in getting the drop down to show up, but there are no values in it.  It is completely blank.  Any general advice on getting drop downs to work?  Has anyone else had the same problem?