The effect I'm looking to use is at the very beginning of the video, where there are really bright and blurred lights. I'm fairly new to AE and searched a lot but couldnt find.
I know the blur is probably just a basic gaussian blur, but I can't figure out how to make those bright lights that later, when the blur is gone, turn into a bunch of hello-kitty(?) pictures.
That is called bokeh.
Lens Blur effects can create it. So can creative use of Min/Max