Beginners questions

[Suspicious_Actions]

@ledOnion

Set up templates with, for example, browsers configured with Arkenfox’s user.js and uBlock Origin so that any Qubes (Including disposable VMs) based on them will already have them set up from the get-go?

You have to start the (dvm-)template and modify it to your liking. Please note, that any modifications to the whonix-ws template might be reset upon update of this specific template.

@ledOnion

Store all my templates AND qubes in a separate hard drive from my main installation? Can I even store them in an additional third drive?

Yes. See here

@ledOnion

Set up a VPN on QubesOS, i.e. MullvadVPN system-wide and in individual Qubes? and connect Qubes to both the VPN and sys-firewall?

You will have to set up a VPN qube. See here. Then you set the network-VM of the qubes you want to to use the VPN with to use your VPN qube. The VPN qube itself should use sys-firewall.

@ledOnion

Install and set up Redshift system-wide?

Sorry, i dunno what that is. If it is a normal program, just install it in every template.

@ledOnion

Install and set up Macchanger to change MAC addresses in individual Qubes

Here

@ledOnion

Have a Qube connect to a VPN then Whonix (Tor-Over-VPN)?

This is generally a bad idea. See here or here.

@ledOnion

nstall and set up Clamav?

This is not qubes specific, i would refer to the Clamav docs.

Please take a look at the Qubes docs and try to search for your answer first.