Can the Proxmox host connect to it's pfsense VM for network/routing or do I need an external network too?

I have a computer I was going to put Proxmox on and then a pfsense VM for FW/routing.

I know that I can bridge the Proxmox host's two ethernet ports to its pfsense VM so all of my external devices (computer, AP, printer, etc...) will get network/internet through the pfsense VM on the Proxmox host.

But I'm at a loss for two things:

  1. How will the Proxmox host get network such that I can access Proxmox's web interface from another computer?
  2. How will other VMs on the Proxmox host get networking/internet? They'd have to some how connect to a NIC linked to the pfsense VM -- right?

It seems to me that #1 isn't possible -- chicken and egg. Or am I missing something?