How do I retrieve multiple fields from SQL?

I am trying to retrieve multiple fields from a SQL table such as customer name, address and phone number by entering the customer # in my form either in a text field or a data drop down list.  I can get the drop downlist to populate from the table, however the other fields do not coorespond to my selection.  It appears that they are from the first record in the table regardless of which customer # I select from the drop down list.  Any assistance would be greatly appreciated.