gandang araw mga boss!

my automatic tranny is aisin warner 0372L. i'm planning to change the ATF and filter. here are my questions:
1. paper type ba o metallic screen ang filter nya? hindi ko pa kasi tinignan. baka may nakakaalam po sa inyo.
2. saan po makakabili ng replacement na pan gasket, A/T oil filter and other parts needed? name, location at contact number ng auto supply. nasa probinsya po kasi ako
3. papano po ba talaga ang pagcheck ng ATF ng matic? check the ATF while engine idling or check ATF while engine is off? i tried while engine is off, may reading akong nakuha. kapag engine idling at naka-"P" at naka-"N" modes ay wala po ako nakukuhang reading sa dipstick. kindly share your knowledge, experience or info mga boss kasi yung aking mga nababasa sa internet halos e "check ATF while engine idling or in Park or Neutral". e baka mali yung reading ko while engine is off. baka masira transmission ko.

salamat po ng madami!