Alignment system?
 

hello, I would like to make an alignment system for my site Pollination.

basically, when you register, you are required to pick one of four planets to hail from, and there will be special forum boards for the Planet you chose.
So when you join a planet, you can speak with other members who live on that same planet, and Trade with your alignment members. You won't be able to see forum boards for the other three planets.

I want this system to make a kind of Lore associated with my site. Right now, my site doesn't have any lore.

Does anyone know how to point me to the right direction in creating an Alignment system?