[mikke1556] “What i want to do is have the glow from the particles “shine into my clip” (which is a green screen video of a person) and have the person glow from it.”
The quickest way to do this would be duplicate your particle layer, blur it and use it as a matte for a levels adjustment or a white solid set to Add blend mode. Pretty much all of your AE based solutions are going to begin with a similar process.
The major downside to overcome with this process is that the ‘light’ won’t interact with the depth of your keyed subject. In reality, a light on the right side of the face should cast a shadow from the nose on the left side. Getting this effect in AE would be very difficult.