Proxmox newbie

Hello, My name is Mike, and im pretty much new to proxmox, I work for architecture firm, they asked me to put a main computer where every employee can upload docs (big pdf files) , and also find a way for them to communicate internally (screenshots and messaging ). so i planned of using windows server computer with a lot of storage, create a shared folders for it and proper backup, and use some sort of messaging software, but since that all they wanna do is just share files, and im trying to lear Proxmox, i want to ask you guys what do you recommend of using proxmox for such a work eviroment…
the server we have is a dell r210II V2 Server with 32gb xeon 1275v2 2x2tb enterprise seagate on raid 0 (controller MR9260-4I)

so my idea is to install a 32gb ssd drive on the server and install proxmox on it, then use the raid controller as raid 1 and have a storage available of 2tb and create the VMS for windows server 2012r2 licenced and openfire for messaging, however playing around with my own server and proxmox this questions are on my head.

Should i use the raid controller, or should i take it off and have proxmox set up the hard drives as ZFS pool? what will be the performance in both cases? (Vms speed) what do you guys suggest? at this point i dont even know if is possible to have Vms running on Zfs volumes. please give me your thoughs. I am here to Learn

If all you need is a file server perhaps something like FreeNAS would suit your needs better. Or just install Ubuntu server or Debian and set up a ZFS raid and use SMB to share the files to windows. Or alternatively you can use proxmox since it is Debian but not use proxmox itself to set up your ZFS and Windows Shares and just set them up through the OS itself.