Workspace 365 Webserver requirements
Webserver:
1-2 V-cores
Minimal 4 GB RAM
30-50 GB Disk
DB Server:
1-2 V-cores
Minimal 4 GB RAM
Minimal 50 GB disk
Bandwidth with 1000 user is approximately 100 GB. Be aware that this depends on the configuration and can be different in others scenario's.