@Bobitaly: I wouldn't not paint if I were you. And there is nothing wrong with using new tech (e.g. photography). I guarantee the old masters would have used those sorts of tools if available to them. My point above about life drawing, is that you learn things from it that you can't learn by copying photos. I think a lot of people use photos as a crutch rather than a tool. It is a quicker easier path, and they miss stuff along the way. Also what I say next may contradict what I just said, but if I had to do it over again, I would have studied constructive drawing methods first (see books by Loomis as example). Once I obtained some mastery over that thought process I would have then moved onto life drawing and then to painting. i would have avoided a lot of bad habits going that route. So how would I fit Mark Carder's method into that mix? I would introduce how he teaches about mixing colors at the painting stage. His thought process and how explains the process of thinking about and mixing colors is very straight forward and easy to grasp for a newbie.
I've noticed something when switching mediums. Sometimes when you switch mediums it becomes so overwhelming you forget the basics, because you naturally become so focused on how to handle the medium instead. One of my mother's friends has been painting in water colors for 30 years and was very good. She understood the basics such as value and composition etc. When she switched to oils, its like she forgot all that stuff and I really think it is it just that fact that the handling of the two mediums is so different it freaked her out.
So if that is your issue, limit your pallet more and paint something simpler. Even a still life of simple objects like a box and maybe an egg with some simple directional light. In addition, limit your pallet to white, brown and blue. This will feel more like drawing and maybe be less overwhelming. As you get more comfortable introduce more colors and/or more complex subjects.