EZGO makes a street legal light kit that would be plug and play. Golf Cart Tire Supply carries aftermarket street legal kits but you would need to contact them to see what they can get for an EZGO Workhorse.
Street legal is easy to accomplish by yourself
1. Windshield and wiper hand operated is fine.
2. Light kit with horn and turn and brake lights.
3. Rear license plate bracket with a light.
4. Seat belts for each seat.
You could also call your local police department or sheriff's office to see what's fully required for your area they will also have to inspect it to verify the street legal so you can get it plated