I'm not sure that TIFF would be my primary choice if I was looking at alternate camera formats. TIFF has been around for a long time, but Adobe Camera Raw or DNG might be a better option.
The first step in your workflow needs to be a NEF conversion. There are two options - you can take the NEF directly out of the camera and immediately convert it to the desired format, or you can enhance the RAW file using CNX2, View NX2 or a third party converter such as Capture One.
Before you move outside of your RAW converter, you want to save your negatives - so your edited or unedited NEF file needs to be saved.
Many photographers use Lightroom for postprocessing. While not exactly a NEF converter, it handles NEF files and allows you to return to the original file. Lightroom would facilitate creating a DNG file.