Custom Item Creation Procedure?

I know the title is not very self-explanatory, but what I am trying to do is have a custom framework (?) to generate a large amount of items without needing to make custom textures and each item individually every time. Basically, how you can add an 'ore pack' and it will automatically add an ore, ingot, tools, armour, and recipes; but a custom one that could say, add, a raw ore, dust or crushed variant, and other recipes?