Problem with us 60 and older guys is that we've given up on learning new technology beyond the iPhone camera. Best advice I can give is turn the video/documentation process over to one of your kids. The younger crowd in my world run circles around me on digital marketing. I'm still old school. The coolest thing I ever did was buy a drone (DJI Phantom 4), that thing was awesome for documenting stuff from above ground level. I took some really cool footage of my property and have posted a pic or two. Only problem is I crashed it into a 80 ft tall pine tree is it was supposed to be crash proof. The new DJI Mavics are cool drones with more than 2 miles of range. We use them quite a bit in promoting biz but I ain't flying them.
As far as hand helds...check out the DJI Osmo cams. They are the latest rage with incredible quality and technology. The stabilization feature is hard to believe. As far as content, you'll figure that out with all the years you've got under your belt. Your passion for being a great land steward as well as desire to grow animals to maturity always comes thru in your written post. I have no doubt it will in your YouTube stuff.