Clubs are least valuable
Melee staves are second least valuable (staves with EE)
Swords are more valuable than both of these.
Axes and daggers are most valuable.
Heavies are very expensive because of how rare they are.
Robes are most expensive of the 3 armor types (heavy, medium, and light). Padded is more desired than plain robes.
Mediums (leather and scale) are a bit less expensive but still very valuable.
Heavy (chain and plate) is least valuable but if they have high EE they can be useful.
All charms have value but generally lightning and wild heal have higher demand than the rest.
The reason for all of the above is because of the classes and what each class can equip. Not many classes can equip heavy armor. Only a couple classes can use clubs, hence why they’re in low demand thus low value. Etc etc
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Now, the stats on the items… it gets more complicated from here. Best advice I can give is to play the game and read some guides. But mostly just play the game for a bit and you’ll develop an intuition for what’s good and what’s not.