First of all open the data sheet and find your specific relay description (section Dimensions), to identify the coil connectors and polarity. Eventually the same information is printed near the relay pins. Or give the full type ID of your relays, so that we can find the essential details pertaining to exactly that type.
In either case you need at least 2 transistors, better a H-bridge, to drive such a relay. The Arduino outputs are incapable of sourcing that much current or voltage as required to toggle the relays.