How do you locate fingerprint?

First you look to see what could have been touched. If a person could not have touched the item, you shouldn't expect to find fingerprints on it.
Next, evaluate what type of surface you have. If it is a non-porous surface (like a soda can), the fingerprint would be on the surface of the item. If it is a porous surface (like paper), the best development method would be one that soaks into the surface because the fingerprint would also have soaked into the surface.
If it is a non-porous surface, a common method would be using superglue fumes to adhere to and stabilize the print. You can then treat it with a powder that contrasts with the color of the surface or dye-stain it and make the print fluoresce (glow under a special light). The print can be lifted and/or photographed.
If it is a porous surface, you can spray the area with DFO and make the print fluoresce. You can then spray ninhydrin on the area and get a visible reaction. depending on various factors, such as limited time and resources, using only ninhydrin and not DFO is an acceptable approach.