There are many ways to make flames.. Hmm I'll try to think of one off the top of my head.. uhh.. ill try to remember:
Make sure your colors are reset ( hit D)
Go to Filter>Render>Clouds
then, Image>Adjustment>Auto Level
then, Filter>Distort>Polar Coordinates (make sure its polar to rectangular)
then go to image>adjustments>Hue/Sat
(these are the levels I use, you can play around with them if u want)
Check Colorize
Hue: 40
Sat: 50
Lightness: 0
Duplicate this layer and go back to Hue/Sat and set levels to this
Don't colorize!
Hue: -35
Sat: 0
Lightness: 0
Set the layer blend mode to Soft Light, and then merge the layer down (ctrl+e)
Now, duplicate this layer and set the layer blend mode to Overlay.
Thats it.. Heres my example: