[villagetinker]

There is a connected Villagers club that will probably have someone who can help. Bob's TV is another source. Finally, you can try YouTube as it typically has helpful videos on these types of problems.
Since this was a turnkey, the first item you will probably need to do is to reconnect all of the devices to your new Wi-Fi network, this is usually a menu item from the remote, that will be followed by updating account info for the various streaming options. The surround sound will probably require working with both the connected TV and the surround sound system, this can be tricky, you need to make sure the surround sound HDMI cable is plugged into the correct HDMI port on the TV, then the TV should recognize the surround sound system.
You may be able to download the instruction manuals for each device from the manufacturers websites, and most of the manufacturers have helplines if you can get through.