Welcome to Android Central! Did it come with a manual? I can't find a link to a manual online.
Also, is this a standalone watch that requires a SIM card, or is it supposed to connect to your phone via Bluetooth and show notifications from your phone on your watch? If it requires a SIM card, then you probably have to get start a new line on your wireless plan and insert the SIM card for that line in the watch, since the watch would be considered a separate phone device.