First, internet forums are an evolving creature and you won't always get an instantaneous response. Give it a couple more hours without a response before freaking out.
Yes, DC-only (direct current) chargers require a 12-volt power source, like a full size car battery or a constant current power supply. You cannot plug this into a wall and charge your batteries in the house without one of the two. Just starting out, you are best off looking for a charger that is listed as AC/DC. There are a few decent options out there in the entry level range, but you will pay a little more for one with the ability to use both AC current (110v house outlets) and DC current (12v).
Someone else may be better suited to make a recommendation for an entry level charger that I would.