right the learnign switch is for if you buy new fobs because you have lost them. im guessing that its a 2way alarm (it will beep vibrate the fobs if they are within a certain range, usually 1mile if the alarm is triggerd) you press the learnign switch for the alarm to "learn" the new codes from the new fobs if you see what i mean.
brake switches i dunno, id try em as negative and see what happens as its all fused so should be ok.
questions 3 &4 i havent got a clue mate, sorry!