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You'll have to remove the door panel to inspect it but it sounds like the window regulator is bad. That's something you will have to purchase at the dealer. Here are the instructions for changing the regulator.
REMOVAL & INSTALLATION
EXCEPT 1995-96 CHEVROLET
See Figures 1 and 2
Fig. 1: Front door glass and related parts - coupes except 1995-96 Monte Carlo
Fig. 2: Front door glass and related parts - sedans except 1995-96 Lumina
Disconnect the negative battery cable.
Tape the window in the full-up position.
Remove the door trim panel and water deflector. in. (6mm) drill bit, drill out the regulator rivets.
Remove the regulator by disengaging the regulator arm from the sash channel.
Unplug the electrical connectors, if so equipped.
Install the regulator through the access hole and attach the regulator arm-to-sash channel.
Engage the electrical connectors. in. rivets to retain the regulator. Check for proper operation.
Install the water deflector and trim panel.
Connect the negative battery cable and remove the tape.