1 Which Impedance do I need? - 50 Ohm is generally used for data. 75 Ohm is generally used for video.

2 12G-SDI BNC Plates? - 12G-SDI Bulkheads - a standard for UHD-SDI (4K 2160p).

3 What does Isolated mean? - This type of connector has a non-conductive mounting flange with threaded barrel,  or a non conductive washer added during install. This provides insulation from the panel and other connectors to reduce concerns such as ground loops, etc.

4 Type of Face Plate? - Bulkhead face plates will have BNC on the front and BNC on the rear. Solder Point face plates will have BNC on the front and solder points on the rear.