You can claim the switch in Organization > Inventory and then add the switch to the desired network. Once the switch is added to the network and connected to the upstream (ISP) it will download the firmware and come online on dashboard. Please make s...

That is correct and can be located on the same page Switching > switch settings.

Just to add more, you can change the priority value under Switching > Switch settings.https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Configuring_Spanning_Tree_on_Meraki_Switches_(MS)

I would recommend to double check all the configurations as per the document.There are no specific firewall rules or limitations. If you are polling from outside, please refer here: https://documentation.meraki.com/General_Administration/Monitoring_a...

Please feel free to navigate to Organization > Summary Report tab for more details on network/client usage.You can also explore Network-wide > Traffic analytics page. Documents for reference: https://documentation.meraki.com/General_Administration/C...