How can I have a 4 or 5 card combination of all different common, uncommon or rare resources?
A combination of different cards isn't bound to one kind of rarity. For example, a 3, 5, 6, 8 and a 9 is a valid 5 card set, which you can trade in for money.
You are not allowed to use Inca Artefact cards in these sets however! Inca Artefacts are either used in sets of the same card (as wilds) or can be handed in separatly for money.