so its just that? chrome and you'll see through the black glass/plastic?

Hey guys

Im new to rendering and got a couple of questions

1. I need some help with rendering cars. I get them rendered, but the headlights and rear lights just turn black so you dont get to see the high details inside the headlights. Why is this happening?

look at the black headlights and rear lights

2. When I render a room inside a house in example, its very dark even tho I make a sun outside of the house. Is there a way to turn on lamps inside the house? Like turn on a modelled lamp? O__O" Also why has this have to happen? What do I have to do?

3. How can I improve my overall rendering?

here is a pic also rendered with Indigo renderer which Im using. How do I render high quality models like this plane? What do I have to do to unleash this power from the renderer on the cars??

I would appreciate any kind of response. Thanks in advance