I use the clutch to engage 1st gear heading out onto the track, and I never touch the clutch pedal again until I come in from the race.
The m/c engine gearbox's are dog engagement, not synchro equiped as in a street car.
Having said that, I know of a feww very fast individuals that still use the clutch on downchanges, I feel it is unnecessary, but I recall that even Rubens Barrachello in F1 still used the clutch up until such time as they didn't have a real clutch anymore.
Bottom line is ask 10 guys what they do shifting sequence wise and you'll get 9 answers.
The 10th guy is a dick and will try to protect his "speed secrets"!
PS Welcome aboard