I have the PLE version
Basically it's just cloud particles from a omini emitter at the appropriate emission rate. It's shaded with a
Here is a render of what I'm trying to do(no missile yet I'm just using a sphere for now)
It needs more tweaking(smoke color,lifespan,opacity etc) but overall if I could just get a small amount of flame then smoke I'd be happy. I thought about a second emmiter but my computer doesn't support hardware rendering so I can't render anything but blobby particles,spheres and clouds.