So after looking through all of the books I can't seem to really find info on making unique magic trinkets or items.
For example, if I were to make a mace that was to shine light as if imbued with the "light" spell forever, how would I figure out the cost and level area for this?
If i'm missing certain resources, please tell me where to find them, if not, tell me how you do it.
EDIT: By the way, I mean creating as in a DM sense of creation, as opposed to creating these items as a player, thanks!