Yeah, so if you want I will do the breakdown ! (It’s odd to make a breakdown of a WIP but why not 
)
So first, the fire is only sprites with this texture, with random rotation on it. I just apply a dissolve effect in order to have the smooth transition on it.
Then, it’s just a tweak with the colors and glow, that’s all !
For the embers, it’s just a simple Turbulence I tweaked in order to have a good movement flow !
I hope I answered well about your ask !
EDIT : I just saw what do you mean about the sphere things ! It’s just an optical illusion, because every sprites have a random life, and some of them, due to their small life, dissolve on the base of the fire and create the shape you mentionned 
If it help you to understand, it’s because I applied to the sprite an initial small Velocity to the ground direction, and then I apply a constant acceleration to the sky direction, so they ‘bounce’ a little and not just go up ! I don’t know if it’s very clear 