How you connect them depends on the sources you have.
To get sound from the Roku and TV tuner to the receiver you will need to connect an optical cable from the TV to the receiver. You may need to turn it on, turn the TV speakers off and change the audio type to bitstream. Check the TV manual. The receiver doesn't support ARC so this optical connection is needed.
You may also need to assign the optical connection (for example optical 1) to an input name in the receiver input set up menu. Check the receiver manual.
If you have any sources, such as a blueray player, that can do lossless audio like Dolby TrueHD these must be connected to the receiver HDMI inputs to get the better sound. The HDMI output of the receiver has to go to any...