First, without the model of your TV *and* laptop, no one will be able to give more than general information. It is much better to provide too much info than not enough - to get questions answered quickly here. With that said..
The short answer is that you need a cable that will connect to your note book (most likely either Video [yellow], S-Video, VGA, DVI, Display Port or HDMI) and the TV (most likely RF, Video, S-Video, PC / VGA, HDMI or RGB) Only the HDMI cable will provide sound with video. The others will require either an audio connection from the laptop (probably via a 3.5mm stereo headphone output jack) to the TV (most likely standard "RCA" jacks [red & white] - or settling for the laptop speakers or external amplified speakers plugged into the headphone jack.
If you are unable to locate a cable that has the connector supported by the laptop with a connector offered on the TV, it is likely because it is not possible to connect the two (HDMI to video, etc.) with only a cable. Additional hardware (probably expensive if available) will be needed to up or down convert & split audio to make it compatible.
Take a photo of the jacks offered by your laptop and those on your TV to a respected TV / Audio store / department for additional assistance. Some Radio Shack store employees are very good - and some are just plain horrible. Save your receipts in case it doesn't work to your liking.
Keep in mind that a $50 Roku box will stream Netflix (and a whole lot more) to most TV's "right out of the box" - or by buying $10 HDMI cable online
to connect an HDTV. Don't spend 20, 30 or more dollars on an HDMI cable unless you want to pay too much!
I hope this helps and good luck!