Aaron's very first upload was a bike cam video:
https://youtube.com/watch?v=nIq26QhUJYw
He seemed to really be passionate (or at least complacently sidetracked) about biking. As recently as a month ago he was still uploading videos like this calling his channel "the home of AaronKingwood BikeCam":
https://youtube.com/watch?v=r6CU5RdfnNg
Outside of bikes, his first video of himself was a prayer video about the upcoming 2013 school year:
https://youtube.com/watch?v=5j6BFU8uP4g
It looks like his obsession with broadcast media originally began with television, as the vast majority of his early uploads were all TV commercials and bits of news... which he of course recorded in the DarksydePhil style of filming his television.
https://youtube.com/watch?v=_7n2Qkxa-lY
This was his first "About Autism" video, uploaded on August 23 2013:
https://youtube.com/watch?v=w2oQ0mLXsIY
His first video about radio was uploaded on August 26 2013, about the "Air 1" station:
https://youtube.com/watch?v=POduxo88-x0
His first slideshow was the "My Slideshow" video from the OP, uploaded on August 30 2013:
https://youtube.com/watch?v=v8qO2zdqgM0
Aaron's obsession with uploading the same scripted videos began on August 31 2013:
https://youtube.com/watch?v=iHL-OKEtmjk