How can I tell of a server I'm starting on EC2 is in the free criteria?
And that same AWS account is linked to your Hub account and you are using a Micro server (as opposed to Small or Medium) then your server should be free (check Amazon pricing for full details and limitations). Using Micro servers via the Hub will not attract any TKL charges for 14 days. After that you will need to invite a friend to continue to use it for free.
More information about formatting options