While it's a good idea to learn on gentle slopes....I think this hill is too flat. It doesn't really lend itself to teaching you how to turn. The problem is, if you turn too much, you'll start to slow down too much so you stop turning....you just end up turning a little bit each time and kind of going straight. Go to a slightly steeper slope and learn to actually do a full turn.
Also, your body position is WAY WAY too far back. You need to not be afraid of the hill. It completely goes against your instincts as a human being, but you have to learn to fight it. Feel the shins pressured hard against the front of the boots.
I can go on and on with pages of stuff you need to learn to do, but at this point of your skiing, it's really hard to teach and learn from comments on the internet. Your learning needs to happen on the snow, not on the forums. You really need a live coach to show you exactly what to do and give you immediate and constant feedback on what you're doing. I highly recommend lessons.
MAs on here are good if you have a decent understanding of skiing fundamentals and you need to find a couple things you can work on. For you though, you really just need to learn how to ski, and that happens on the snow (ideally with an instructor).