Typical resource usage and costs of running rocket.chat on AWS or Digitalocean?

Helly community, startup founder from Amsterdam here!
Very excited to find out about rocket.chat/ My goal is to use rocket.chat as a customer live chat solution.

What can be expected the costs of resources, when deployed to AWS or digitalocean?
How resource hungry is rocket chat.

We only need it for like 10 agents that chat with customers on several websites.
We only going to use the live chat feature for now.
But i Definitly look how we could integrate this project in our company communication as well!