It's a little robotic but it's the best 15 minutes you can spend to get up and running on Studio One:
Also go to your My.PreSonus account and click on Studio One in your list of software you own. If you scroll down there should be training videos by PreSonus. There are for the Pro version, but you'll have to look for Prime (which is basically Artist now).
Lastly, for more comprehensive training, spend $25 for a month of all access to Groove3.com's Studio One Vids, there are TONS of training vids, and since Studio One Prime is older, I suggest you watch the Studio One 2 videos, because the version 3 videos build on that, then eventually when you upgrade to v4 there are videos covering those new features as well (don't worry about the prices of each course, you can watch by streaming 24/7 for a month for 25 bucks). When you see training vids that just say Studio One without a version number, those usually refer to the first version which is too old, I'd avoid those. But starting with the Studio One 2 vids is the best route IMO. It's how I learned, and it's the only DAW I've ever used since I got started in this 5 years ago. I'm also a long time FOH engineer who fell into audio recording and now MIDI orchestration... you're on the right track going with Studio One.