Plaster and paint chimney drywall

I need a tall, narrow chimney drywall enclosure plastered and painted as soon as possible. The two main sections are approximately 2.42 m high and 0.43 m wide, with the drywall currently bare and unfinished. The enclosure runs from the floor to the ceiling in an indoor room, as shown in the image. The job should include preparing and plastering the drywall, then painting it for a smooth, finished result. I already have the right paint but not everything needed, so the remaining plaster or other supplies may need to be provided.