You’ve got a number of questions going on all at once. If you are specifically asking how to fit an R9 module to your Taranis Tx and matching receiver to which ever quad you intend to use, there are a number of tutorials online to help you.
As for running goggles with your setup, you’ll only be able to use a Fatshark or similar analogue type goggles. You can’t use the DJI RE racing goggles as the are designed for a specific DJI product (Mavic I think).
If this is your first long range setup, be prepared to spend up reasonably big as any gear related to distance flying that is reliable needs quality parts.