I know the answer to the second question only, so trying my best to explain that....
Past perfect pregressive means some thing (some sort of work) that was done in a continuous manner in the past but is not done now.
like you were going to school till your 10th standard and now you have completed your schooling and presently involved in a business or sth like that.
In that case you can say that "I had been going to school before my college days".
Past perfect progressive is used to indicate a continuous period in the past (past means somthing which is not done now).
I had been an assiduous and meticulous person before I got a job.
In the above example I now considered myself as a bit lazy as compared to myself before I got a job.
Hoping that I have made my point clear to you and it is making sense to you.