1. You can connect your Firestick to any input on your TV. If your TV has a HDMI (ARC) connection, then you should use that connection between the Yamaha and your TV. Then plug your Firestick into ANY other HDMI input on the TV. Let's say your TV is setup this way:
HDMI 1 (ARC)
HDMI 2
HDMI 3
Plug your firestick into HDMI 2. Plug the Yamaha into HDMI 1 (ARC)
Turn the TV on, and put it on HDMI 2.
Turn on the Yamaha.
If things work right, which they sometimes do, the Yamaha will automatically know to use the audio return channel (ARC) from the TV for audio playback.
If this does NOT work, then you may want to hook an optical audio cable from the TV into one of the inputs of the Yamaha. That's a different discussion.
As a follow up question: You could just hook the Firestick up directly to the Yamaha and then turn on the Yamaha to the proper input and leave your TV on HDMI 1 all the time. This is what their own manual recommends that you do. It does require that the Yamaha be powered on and switched to the proper input every time, but that can be handled by a $50 universal remote.
2. Front presence speakers are NOT what you have. You have your main Front Left and Front Right speakers. That's where you hook up your speakers. Presence speakers are for sound effects in movies and are part of a larger 5.1.2 type of setup (or similar).
Back of your product I believe: