Please note following is the corresponding fingers for the Number specified and are based on using Right Hand to play the melody on Keyboard.
1. use Thumb
2. use Index finger
3. use Middle finger
4. use Ring finger
5. use Small finger
Please get to the above link and we have detailed the sarali varisai format to be played with recommended finger number for each note / exercise mentioned for the first speed of all exercises.
We have also given the format for different speeds including the mixed speeds in one cycle / avardhanam for each exercise.