Now PW client in the past for me so I can't point to exact offsets or give exact BA value etc., but I can help with basic concepts.
At the beginning, try to find all "specific" commands, e.g.:
mov ecx, GAME_BASE_ADDRESS or
add ecx, 0xEC
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Then put BP on each result.
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Start game; wipe out unnecessary BP (walk, jump etc)
Do something, something which function you want to find (e.g. attack)
Probably, necessary BP will fire or point you to routine which take part in your game action (attack). So, trace this routine and examine results
About second. As I remember, PW has no function call for direct farming. You should use... hm... I forgot :) (if I find my old debug list and notes, I will post some additional notes)