Hi Arut,
I have started my training two weeks ago, I started reading the Air Pilot's Manual Volume 1 in the week up to my 1st actual flight yesterday and I have to say I'm so glad I did as I knew what was going on then. Can't say I agree with those who say it would confuse.
As far as the flight sim is concerned I would also disagree there. I know I'm a newbie and more informed people might say otherwise but I found the flight sim a great help when I had the 1st lesson.
I have only been using it for a month or so with the pedals and yoke but when it came to getting my hands on the real thing; trimming, turning, climbing etc it was a big help. I also knew where to look for the instruments as well.
Agree with those who say it makes you focus on instruments but I find if I look at horizon in sim as in real world it makes it easier to fly level.
If using flight sim it is a good idea to get a friend to tilt your chair when you turn and pitch just to get the feel of the real thing.
(^^ Only joking BTW)