I'm going to show you how to make my version of fire text. This is my first tut so please try not to be too harsh. Of course, if you want to you can change the colour but it won't look like fire. This is what you should end up with:
1)Render clouds
2) Use these settings (default with blend mode set to difference)
3)Repeat clouds
4)Use colour balance
5)Use around these settings
6) Create a new layer
7)Fill with black
8)Type your text in white
9)Select the text with magic wand
10)Delete the text
11) Flatten the image
12)Select the black background
13)Delete the background
14)Use glow
15)You're done!