Once exposed to light you'll see where the new growth emerges - that's the spot/spots where the eyes (you couldn't see) were.
Eyes:
Tuber showing growth:
April is a good month to start them indoors, under lights.
For planting in the garden, this video explains it well: 6" deep is recommended, NO exposed neck, lay them on their sides
https://www.youtube.com/watch?...
