How to create item database?

In my game i want to have different items and want to store all of them in single prefab as array. But i fail to even decide how to make it easily editable. Please advice, how can i achieve:

• be able to add array items in inspector

• have item properties as a table

• optionally would be cool to be able to display preview of assigned model

Is it property drawer or custom editor? Or may be i should create whole custom window? I'm very newbie with unity..

I also don't know what would be better - to store custom classes in this prefab, or instantiate those custom classes at runtime with properties from this database.