Welcome to the community!
Are you able to identify the location where the rest of the utilities enter the house? The main cable source possibly enters the house there as well. If the rest of the house is not connected to the the cable source, that could explain why the rest of the outlets in your house don't work. In theory, as long as all of the outlets are connected, it shouldn't matter to which outlet you connect the modem. However, if those outlets are not connected to the source, none of them would work. Are you using any of the outlets for cable?
If the outlets are connected to the source and those outlets still don't work, you might need to contact technical support. They may need to send a technician to verify the functioning of the outlets and source cable.
Hope this helps 😀
Your modem should have come with a coax cable of its own. You can then connect this cable to a coax wall socket (the connector looks like a circle with a dot in it).
Once you have the cable plugged and the modem connected to a power source, you should be able to use one of your devices to search for available Wi-Fi networks to go through the Easy Connect steps.