My first network architecture (Proxmox + hp switch + WG firewall + peplink)

basically I have to build an entreprise level network using a proxmox cluster made of dell servers (I am not sure which Dell model for now) I also have in hand an hp 3500 with a watchguard firebox T25 with a peplink internet access ( I am not really familiar with peplink so I am not sure if peplink will have direct access to T25)

I have to install a Zabbix VM so I can monitor the whole architecture with a windows 10 VM inside the proxmox cluster in order to manage the architecture

any advice or guidance will be so appreciated about Vlan conception, firewall security , literally anything and thanks