above pic taken by my son of himself no flash no light except stars.
there are various external flashes. i have not bought one yet but my buddy bought the $500 nikon external flash for weddings for his d-5000 and he really likes it except ya gotta have alot of spare batteries to run it.
take camera with you every day and take STOOOOO-PID pics to learn camera. its brain is wayyyy larger than ours as far as functions.