How to train low cost or just have an idea to how to train?

[Toxcatl]

That's because you're training for mutant players - I train for players with balanced skills. My power training works for me - yours works for you...

Wait, you said:

You need to select a different single drill every time as repeating a drill loses the full benefit of the training.

You even highlighted it. I don't understand how repeating a drill will reduce the benefit of the training, and how does it connected with mutant or balanced players?
I'm not trying to be offensive, but it looks like you are selling your feelings and guesses as truth, with no room for doubts. I guess you believe in god too.

so you are going for balanced white skills. ok.
what would be right balance, how much offset in them would be acceptable?

and what about special abilities, let's say player has dribling SA, does it not make sense to push for drills that emphasises dribling even more? let's say 20% above his other attributes?

No one know for sure what skills and SA do. There are no tests, no research, nobody can prove that balanced players are better or worse than mutants. I tried both ways, and I liked mutants better. But, honestly, I have no proof, there are enormous amount of other factors. Many successful managers, like nikolgiorgos, think that skills don't matter at all. They may be right.
So it's up to you to try everything and believe in what you want to believe. Just take other's advises about training process with a grain of salt.
The same goes to exact orders for a formation. We know almost nothing about the mechanics. And anyone who says "do like this, not like that" knows even less.