I am trying to connect Apple TV and a Samsung Surround Soundbar (HW-E450)

I am trying to connect Apple TV and a Samsung Surround Soundbar (HW-E450) to my Westinghouse HDTV. My TV has two HDMI ports one of which is currently connected to my cable box. How would you suggest I connect the Apple TV and surround soundbar? I have one High Speed HDMI cable but am not sure which device to connect with the HDMI cable. Also, I am assuming I need to buy an optical cable. Any advice or suggestions would be greatly appreciated! Thanks.