Vedder is getting you in the right direction.

Another way to 'cheat' low light/ indoors, is to shoot with a very open aperture (low f #) which gathers the most available light. You will also have to slow down the shutter to gain more light. Try not to go below 1/40 sec, or you will see blur just from your breathing/etc., without a tripod. Don't go past 800 (I don't go past 640) on your iso.

Also watch your white balance settings (WB). These can realllllly effect the color tones and brightness . Each setting has a symbol; lightbulb for incandescent light (indoors), sun for sunny outdoors, shade/cloud for overcast or shady situations, flor. tubes for indoorflorescentlighting.

Take LOTS of shots, take notes on what you like/don't like, then look at the image properties for clues/settings.