Well starting off, let me ask this!
What makes indoor pictures so great? The figures? Sure. The Sets? Of course! But what makes the scenes dramatic and just brings everything to life? The lighting and of course, the angle!
But how do you capture these images? Well something that helps more then you think, is a Light Tent. Sure they are expensive, but its simple to make a homemade one.
Those are for general all around light. But to make the shots stand out, you might want to invest in multicolored lights that add effects and emotion to the shots.