Parameters passing of select_tag

I wish to have an option in my application where user can select a
value from Combo Box shown in a page and on clicking of button this is
passed as parameters to another controller. There will be 4 combo
boxes on the selection page. I am using select_tag to populate data
from database

Something like

Town <%= select_tag(:town, "<option>-Select a Town</option>" +
options_from_collection_for_select(@towns, :NAME, :NAME)) %>

Can you please suggest what is the method to do it ?
I am not able to find some clear guidelines for the same, I am new to
web development so maybe I am searching at wrong place.

how about the rails api doc ?

I had to place everything in form_tag and everything else worked fine.
Now I have all values in Parameters list