First of all thanks for all you comments. Though, I have to say do that I did’t quite understand what you meant about the eyes, FreakyDude.
Ok, anyway I have started to rig him. And along the way couple problems have appeared. First of all I started to build the rig like the one on Nathan`s video tutorial but I got stuck with the weight painting. On his tutorial seemed to but quite easy since the object mesh is rather simple. Unfortunately with my model, which is kind of fat, I´ve started to get some problems while painting, The reason is that whenever I manage to set up some good deformation for one pose I was getting some strange ones with some other poses. After a while of trying to arrange it I realized that with time I had made too much mess and its better to start over again.
I have tried the other way around I used the heat painting option which gave me, for start, some decent weights. Obviously they were not perfect so I had to tweak them and again,after a while, started to get some messy results. Therefore I realized that maybe the problem is that I don’t understand really how the weights work. For example, I don’t know If they should overlap each other and If so in which degree and where. Another thing I had doubts was that which of the parts of the mesh should have deformation strength 1, which one 0, and finally which one in between. Also I started to wounder If actually my armature is correct and maybe I should add some extra bones for the chest area for example.
And in the end I was wondering why some parts of the mesh while deformed were shrinking. For example finger tips. Whenever I was moving them downward the were getting squeezed.
I would really appreciate any help with this issues. Maybe you know some tutorial about weight painting?