In terms of bandwidth, a lot will depend on which PeerTube instances you federate with and what your relation with them is (more about that below).
PeerTube should run happily on a virtual machine with 2 threads/vCPUs, at least 1 Gb of RAM and enough storage for videos. In terms of bandwidth, a lot will depend on which PeerTube instances you federate with and what your relation with them is (more about that below).