Grats!!! So exciting!!
You don't really have to charge for 8 hours. And the light the charge part the battery screws into is the indicator of when a battery is done charging (most go full green or full blue on a complete charge and may alternate colors during a charge). The light on any separate AC to USB adapter is random - one of mine has a red light, one has green light.
And if you ordered a 3-piece, most attys comes with primer on them and that tastes bad. You want to get rid of that.