As others have said, 1 GB RAM isn’t enough. It also isn’t a good deal. You can get old NUCs for $30-40 with 8 GB.

Setting up an SMB or NFS share is the correct answer because op has stated he plans to use VMs (plural). ZFS is not sharable without it. https://pve.proxmox.com/wiki/Storage

There are forum posts going back years about it :https://forum.proxmox.com/threads/share-zfs-storage-between-nodes.144790/ https://forum.proxmox.com/threads/create-a-large-pool-of-shared-zfs-storage.94435/

TrueNAS is not absolutely required. It can be done with a different Linux distro. I use/prefer Debian.