Before you start segmentation please take a look at tutorials / user guides. If you decide to use Nvidia Clara you can find more information e.g. here: https://docs.nvidia.com/clara/tlt-mi/clara-train-sdk-v1.1/index.html In short: it depends on your approach.
Also, think about the structure that you want to segment. You might want to start with a larger structure than inferior alveolar nerve – small structures tend to be more difficult to understand by AI models.
Is the segmenting is the usual process with Segment editor ?
Yes, the process of creating the “ground truth” segmentation can be done completely with Slicer tools. Usually, you’ll want to export your segmentation masks into binary label maps (through the Segmentations module).