How to set up mail queue

Just installed this plugin – and it seems great. Yet, I can’t find any documentation, in particular about how to set up the queue.

My ISP gives me a maximum of 100 messages sent per hour via SMTP.
Ideally, I would like to send everything as fast as possible – until 80 mails in an hour are reached. Then, I’d like it to wait for an hour.

Alternatively, I would like it to send one email every 45 seconds. That would always keep me under my limit.
With those three parameters… how do I set that up in GD Mail Queue?
Thanks for any hints!