Ideally, you would want a good quality PSU that beyond the minimal specifications for that card. That also has the required connections to power the card.
You would need to ensure that your motherboard has the PCIe connection for the card to fit into.
You would want to ensure the card will fit length wise into the pc case you own, without comming into contact with any other components (motherboard heatsinks, RAM, etc..). I would make sure you have a good air flow in the case as well, to provide the gtx 970 with the cool air it needs to stay as cool as possible.
You would want to make sure your CPU is capable of pushing the card to its potential, or you are just wasting money and would be better suited at a lower performance card that better suits your CPU's capability.