If I'm not mistaken, the "protecto" system is what we commonly refer to as a "builder's" lock. It will work just like a Master keyed lock in that numerous people holding a valid key can gain entry, UNTIL the home owner initially uses THEIR individual Protecto key.
Once that particular key is used, all the other keys that previously worked in that lock will no longer work.
Check out
Safeguard Properties' website for the rest of your answers since you will be doing primarily what they do.
On the debris removal, I think it is how much you will be
reimbursed for... not how much you are
allowed to remove. Usually it runs about $40 - $60 per cy, up to a max of about 12 cy per single unit.
Helluva tough business you intend to get into. Hard to make a good buck.