When the clutch pedal is in and in gear, there are shuddering sounds from the clutch and the idle pulses. There are other noises such as a slight scrapin sound. What can this be? pls HELP

It is said to have a brand new clutchmasters clutch that is not broken in yet

 

You know you have a problem, so pull the transmission and check everything. This will give you the correct answer.

But since you want to guess; throw out bearing or pilot bearing most likely.
Next would be a clutch fork starting to crack and pulling unevenly on the throw out bearing.