Yeah, as Eake4 was saying, most fires aren't actually an effect, but just stock footage. You can get lots of good, HD stock footage from here
. There's ways to get it free as well, but you didn't hear that from me
Once you have the stock footage from this pack in particular, you just create a new layer and set it to screen. Setting it to screen will get rid of the black background
For the text I'm not exactly sure how to do that but maybe it would be a much simpler variation of this tutorial
? In general Video Copilot has a lot of great tutorials for learning how to create different cool text related effects using AE.