What do I need to plug my iphone to my car?

I have a 2007 Santa Fe hyuandai and there's no plug and I don't a cassette player. Only have a cigarette plug. What do I need?

Buy a CD player with the front jack point.

You can get a FM iPod transmitter which would be your cheapest option. The other option is to buy a new radio head unit or an aftermarket one with an auxiliary (headphone plug-like) or a USB plug