That water seemed kind rough. Learn to know when you just shouldn't go for a trick. Once you build up a strong base and become more confident then its easier to ride in rougher water and rollers.
The same goes for when the boat's turning. Become conscious of the area you're riding in and when the boat has to turn to avoid shoreline or other boats. When the boat's turning the wake changes as if there's loads of weight on one side and none on the other.
From the start it looked like a decent edge but then you sat down. Remember to keep you body position almost constant throughout the whole approach and don't sit down as much. You don't need to squat to jump, the wake does that for you. Proper technique and timing are way more important.
For learning you should be using a progressive edge to jump the wake. Start out maybe a touch wider and let the boat start to pull you in. Slowly build up your edge as you approach the wake, being conscious not to break at the hip. The angle between your torso and thighs shouldn't be straight but it shouldn't change. The closer you get to the wake the more on edge you should be, reaching the climax at the top of the wake. That doesn't mean that you should be edging as hard as you can at the top of the wake. It should just be the hardest edge of that approach that one time.
At the top of the wake push off with your legs. Like I said before you don't need to be squatting down, but your knees should be bent between 90 and 135 degrees. Push off with them but don't hyper-extend them. As you push off the top of the wake push the handle down and look at the horizon in your direction, not the boats. Bend you knees to absorb the landing and ride away.
Finally I can't tell from the video but please don't become a heelside hero. A lot of people starting out are guilty of this and they miss out loads.
Here's a couple links that could help.
You could also check out the trick tips forum here for loads of advice on progressing