i want to put .1uf capacitor between v+, GND for each IR sensor for preventing noise do u think it is worth it?
Usually we first try to get the important parts assembled and working, or semi-working. If you find that noise is a problem, then you can start adding capacitors.
I don't know how choose between 10-22k resistor for photo NPN.
We can't know since we don't know the characteristics of your phototransistor when it's facing the floor. A potentiometer will let you make adjustments. Experimentation is the only path to success while you are developing a project like this.
My sensor going to placed .9-1 cm from surface.
I had a line-follower robot called a Movit (commercial kit). It would not follow a line properly, or it would lose track of the line easily.
In an effort to make it work, I had to break the neck which held the sensors, and then glue it back so the sensors were snug to the floor. The robot worked very well after that. In fact it would follow the crevice between wood floorboards.
Before then the sensors were probably not more than 1/10 inch above the floor. That's how much difference there was between success or failure.
I can hardly imagine how the Movit manufacturer thought they could get away with it.
So if you want to put the sensors 1 cm high, then you will need to make custom optical sights for them, to focus on a narrow line 1 cm below.