The setup may depend on your TV and other components and how you plan to use the system. Does your TV have analog or digital audio outputs? The receiver has analog and both types of digital inputs (coaxial and optical).
Use the best cables that you can. You can get all cables at online cable stores for much less than at the electronics big box stores. I'll assume that you already have the speakers connected to the receiver.
Next you can either connect your devices (cable box, blue-ray player) the receiver's inputs. Then connect the receiver's video out to the TV. This is great if you will only listen to the devices with the home theater system. Then you can also connect the TV audio out to the receiver for the OTA TV audio. For this you probably need component video cables and audio cables. These are all cables with RCA plugs.. Then get another audio cable for the analog or digital optical output of your TV. For some TVs the only audio out is the headphone jack. In that case, you also need a 3.5 mm to RCA adapter (the simplest is 3.5 mm M to RCA F/F for connecting to an RCA audio cable). For this method, you won't have to turn off the TV speakers most of the time; the TV won't have any audio.
Alternatively, connect each device audio/video out to the TV's input and then only connect the TV's audio out to the receiver DTV audio IN. Since the receiver doesn't have HDMI, this is the best option if your devices have HDMI out. For this, use the appropriate number of HDMI cables and the analog or digital optical audio cable from the TV to the receiver. Then turn off the TV speakers and enable the external speakers in the TV menu. You can connect to any of the receiver's inputs. If you use the labels, you'll find it easier to turn on the inputs.
If you have any devices with composite video output, use the same basic steps as for the component
The documentation for the RX-V2400 is available at the Yamaha product site: http://usa.yamaha.com/en/products/audio-visual/hifi-components/stereo-receivers/rx-v2400_black__u/?mode=model
. You'll need to be a registered Yamaha user (Easy-Pass) to read the manual online.
I hope this helps. Please add a comment with your devices (including the model of the TV) for more specific information.