Well, you might wanna find a tutorial on traditional 2D animation. Aside from creating the right keyframes at the right time this has very little to do with AE.
It's just a matter of an opacity crossfade. For what I do I usually use 3 frames with a one frame over lap. That's the front head fading out over three frames and the side head fading in over three frames starting on the second frame of the front heads three frame fade out. If you don't like the cross fade then you probably want one or two more drawings (in-betweens). Then just line them up, one frame each.
For the air blowing I would take advantage of AE's tools and use stroked paths with the trim paths effect.
and for turning face to left, i need to make 3 vector faces of FRONT, IN BW, AND LEFT SIDE???
for blowing aIR .. i again have to draw a vector with "O-shaped mouth"???