Fluids are very straight forward.
Engine oil: drain plug on the sump (14mm bolt). Oil filter hidden behind plastic guard under A/C compressor once the drivers side plastic guard (engine area, not wheel area) is taken off you can't miss the filter.
Oil change is very simple, drain it on hot, put the sump plug back in and tighten (not too tight, the oil is not held by thread, but by washer), swap filters (fill filter with oil too if paranoid like me), make sure the gasket from old filter is off as well (sometimes cheap shit filters leave gasket behind). Filter must be tighten 3/4 turns by hand from gasket contact. Fill the engine with oil, hold the can sideways not vertical (like so [o----] ) , otherwise it will be "gulping" you will have oil everywhere. Put the oil cap (aka 710) back on.
Start the engine, immediately check for leaks, especially around the filter. Stop check the oil level again, most likely you will need to top it up again. You will need about ~4L.
Gearbox oil: there are 2 drain plugs (24mm bolts) on ST205, one on the transfer case (right side of the car) another on gearbox itself (right under left inner CV joint). Gearbox is filled from 1 place - half way on the gearbox there is a bolt 24mm facing towards radiator (confusion arises because it needs to be drained from two places). Drain from both places, tighten drain plugs (not too tight - again - washer). Fill via funnel+hose, takes very long, recommend placing (un-opened) oil jugs in hot water for 1 hour before. The side fill hole determines the level of oil, if oil starts coming out of it it means it is overfilled
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. When the gearbox is filled properly the oil would be just up to the fill hole on the side of the gearbox.
it takes slightly over 5L.
Diff oil: $$% pain in the ass if you don't have big as suringe or some pumping device. I would not recommend doing it unless you have a way of pumping oil into it. You could get away with hose and funnel sticking out on side of the car but takes ages and is very messy. Drain hole is right on the bottom of the diff, you can't miss it. The filler plug is on the back where diff mount is, there is even a provisional hole for the socket to reach to it. Same as with gearbox fill to the level of drain hole, excess will come out of it. ~1.1L
NOTE: first oil change is bound to be extremely messy, stuff like draining wrong oil (gearbox instead of engine), pouring oil while drain plug is undone, forgetting to put oil cap back on when starting the engine, and other silly stuff like that happens to best of us, so best to do your first oil change with a mate that checks your doing. And double and triple check that there is oil in engine before you start it.
WARNING: common sense applies.