Please Help with Network and Switch advice?

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You do not need a 10GbE Internet for a 10GbE devices to work. This is something for local use. Connecting to or from an outside world will always be different.For local video editing, you simply connect dual 10GbE LAN port switch with additional 1GbE ports. All these switches will have big enough switching fabric to ensure there is enough room for 10GbE as well as 1GbE traffic. You can then connect your NAS and your PC via these 10GbE ports and the rest of the devices will connect via 1GbE. You will need a 10GbE card for a NAS though and same for a computer if you have none. If switch seems too expensive then you can connect a NAS directly to your PC and another LAN to a router.I hope this helps.