Hi Daniel. Congratulations on starting your YouTube channel. Best of luck with it!
I'm not qualified to critique the content of your videos, I but I am perhaps qualified to comment on your production values. I'm now a network radio announcer, but early in my career I was also the sound and lighting producer for a regular segment on NBC-TV's "Today in New York" program. Perhaps you might find some of the things I learned there useful.
So after watching a number of your videos, here is what I would suggest:
1. Get
at least a lavaliere microphone. Upping your audio game will make a huge overall improvement in your videos. Right now the little condenser mic on your camera is just not cutting it. Especially when you're shooting in a room with so many hard, reflective surfaces. It sounds, well...get a lavaliere mic. (When my wife started a YouTube channel earlier this year in support of her business, I gave her an Audio Technica ATR-3350 lavaliere mic, 30 dollars on Amazon. Even that inexpensive model made a WORLD of difference. Hers has a wire, but they make wireless models also, for a bit more.) If you go out in the field and shoot footage at, say, a tasting or festival, get a shotgun mic. (My wife's is a Lyx Pro CMG-50, works fantastic and still inexpensive.) ANYTHING but the stock mic will raise your game.
2. Get rid of the fish-eye lens. If your camera has a fixed lens and you can't change that, get a new camera. You don't have that big a set that you need to see everything in a 180-degree sweep shot. In fact, in a lot of the shots you see extraneous crap on the sides that only detracts from any classy, refined ambience you may be trying to achieve.
An adjunct to that, and this applies to any lens you use:
frame your shot. Seriously, and no offense, but a lot of your videos look really amateurish just for the simple fact that you don't know how to frame. You need be make sure that you, and whatever you are discussing in that particular segment, are the main focus. Don't have too much space over the top of your head...or below your belt (unless you're showing off your dubstep moves)...don't, for the love of god, have the camera tilted over so it looks like you're shooting on the deck of a sinking ship (get a tripod with a bubble level, and use it)...don't have the camera too high up or too low down so it looks like you have alternately all chin, or no chin...etc. What I would suggest you do is set up your shot, then shoot about a minute or two as if it were a real take (that is, with you in it talking), then stop and watch what you just filmed. Check to see that it's framed ok. If it isn't, adjust accordingly.
3. Oh my god dude, take 10 minutes and watch any YouTube video tutorial on "3 Point Lighting". Seriously, your videos will be so much more professional looking if you just get some basic lighting techniques on your side. I mean, look at your "How to Know When a Wine is Corked" video. You have a spotlight trained directly on your face, which not only over exposes it, it also casts a big shadow behind you. That is classic horror movie lighting for the scene where the clown at the carnival pulls out the knife and plunges it into the chest of his next victim. I'm not kidding, that's the lighting they use. In other videos you light severely to the left or right, leaving one side of your face in darkness, like a Caravaggio painting. Don't do that.
I would suggest getting at least two "soft box" lights (I have LimoStudio 700 watt units, 75 dollars per pair at Amazon) and learning how to use them. It's not hard, basically one light is your primary and is pointed more directly at you, the second light comes in from the other side at more of an angle to cut down on the first light's shadow. You can get an overhead light if you want (it's 3-point lighting after all) but in your case, like mine at home, it looks like you have a decent overhead light already so you probably don't need it.) For close up work you can get ring lights that attach to your camera lens, but they're pretty expensive. Still, if you money is no object it's a good bit of kit to have.
4. No offense buddy, but I think it would help if you worked on your camera presence a bit. You're a good looking guy, and I'm sure given your family background and professed passion you know what you're talking about. You even wear appropriate clothes - kudos for that. But despite all that you're coming across on camera as kind of a sleepy automaton. Some unkind souls might even opine you had imbibed too much of your wines before filming them. You gotta raise the energy levels a bit here with your delivery. Not wild-and-crazy, but at least up to the level of "seems awake" (and it doesn't help that in a lot of your vids the camera is lower than your head, so with your head tilted back it make you look like your eyes are closed).
I know the length of this probably already qualifies it as a TLDR response, but if you're serious about making a channel that supports your family business I think these are all things you might want to consider. If I may just add one last, overarching, comment: there are dozens of wine channels on YouTube, many with very slick production, and entertaining hosts. People aren't gonna watch (or subscribe to) yours if your stuff has the same production values as the anime reaction video some kid makes in his basement on his laptop. Wine is percieved as classy, for better or worse. Try to make your videos reflect that with classy audio and video. I think you'll see results if you do.
Again, all the best to you. Hope my words weren't TOO critical. FWIW, I do mean them to be constructive.