Question / Help Setting up Dyn Url

I am setting up a Dyn DNS url to send audio from our church to the radio station live. I have two questions:

1. Can I use an http in OBS to stream or do I need an rtmp?

2. What is the easiest way to set this up? I have the hostname in Dyn but I need to get stream keys and the rest of this so the station can type in a url to open on Windows Media Player.
 
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