How to setup ASUS RT-AC86u router

I have purchased an AC86U router and would like some help on the best way to set it up so that I have optimal wireless speed.
The router is going to be used to:

1. Connect to a 8-port Netgear switch where I run various Ethernet cables to a SKY satellite box and other mini satellite boxes
2. Connecting to a TV for TV streaming, e.g. Netflix
3. To a TADO device that only me to control my heating wirelessly through an IOS app
4. To a Vodafone Sure signal device to strengthen the phone...

How to setup ASUS RT-AC86u router