Use Film
One of the easiest ways to achieve a retro look in your photos is to shoot with film. Film looks different in print when compared to photos shot with a digital camera. To further enhance the retro look, use a black-and-white film that has a significant grain signature. Some films show small pinhead-size dots; this is grain, and it can make a picture look retro. Generally, the higher sensitivity (ISO or ASA) of a film, the grainier. Some photo editing programs can simulate grain in digital photos.
Lighting
Study some retro pictures and pay close attention to the type of lighting that was used, then recreate the lighting in your home or studio. If you want high-contrast lighting, you simply need one light source positioned on one side of your subject and a white reflector card on the other.
Wardrobe
Nothing says retro like an appropriate wardrobe. Study pictures from the period you are trying to replicate in your shoot. Identify articles of clothing that are associated with that time period, and look for them them in a used-clothing store.
Hair, Make-Up and Accessories
Replicate hair and make-up styles to enhance the retro look. Accessories can include styles of glasses or hats that were worn in an earlier period. Using all of these approaches will give your photographs the retro look you are shooting for.