Rely on the Information Professionals at your library to share public health announcements and updates regarding Covid-19 prevention and vaccination. Official resources are below:
This page on the official State of New Jersey website is a good place to start.
The opportunity for any resident of New Jersey to pre-register for the vaccine is available here.
On a more local level, the official Bergen County website has information pertinent to county residents, including a link to register for the vaccine for those currently eligible to receive it.
You can find information on Bergen County testing dates in January here.