Tips to start making a little production
The minute you said "no lighting" you violate the premise of "look as professional as it could be and not too amateur".  Lighting is not only about ensuring there are enough photons to actually record decent image on the camera's sensor.  Lighting defines highlights and shadows, contrast ranges, areas of focus and mystery, etc.  It is almost impossible to overstate how important lighting is to the look of an image.  The understanding of lighting, and use of that understanding in the control of lighting, is perhaps the single greatest factor that separates professionals from amateurs and professional-looking results from amateur-looking results.