Welcome to the world of shooting. As stated above, if you are looking to get sponsored there are pretty much three ways of accomplishing this.
1) Start competing in USPSA, IDPA and Steel challenge events. As you continue to compete and gain classifications in divisions along with either winning or consistency scoring high in local and not so local matches, vendors/sponsors will notice you and may approach you to sponsor you with certain items that you may need or use. If they are going to have you be a walking billboard for their products, they are going to want you to show off the items with skilled shooting.
2) Know someone. I have been to many local USPSA and IDPA matches and there is usually a couple people that have lacking shooting skills. But since they are out at a lot of the matches and they happen to be friends of a company owner, they get the sponsorship "hook up."
3) Get on Youtube and make a ton of quality videos. I know that there are a lot of not so known named people out there that are sponsored by companies based off of their reviews. yes some compete, some don't, but overall if people start to follow your videos and like them a lot; vendors will see this and recognize it as a good way to get their name out.
As a side note. I am not a sponsored shooter, so these are just my opinions from what I have noticed in my time competing in USPSA, IDPA and GSSF matches. And 5 years of working limited hours at a local shop. Their may be some sponsored shooters that could chime in.
From looking at your video of you shooting the GLOCK, I would highly recommend that you re-position your left hand thumb. Keeping it behind the slide like that is setting you up for a thumb injury. You got really lucky that you didn't smash it on your first time to the range.
Either way, great job on your first time going out shooting.