a) Too many factors to tell. Just test it.
b) Put it onto a CPU and compare it to another known (tested by the big boys) block. It'll give you a rough idea.
c) Yes. I suggest not using a hammer, though.
Seriously, the modern CPUs havea thermal cutout. You're more likely to damage things through mechanical action than thermal.
d) Any one of them but toothpaste. Seriously, they all perform fairly similarly.
e) I'm not a block designer.
Your english is fine. Good luck!