It looks to me like you should leave the car alone if you don't know the oil drain plug is on the bottom of the oil pan. It is hard to miss or mess up when you use the right wrench and that plug usually is pretty tight. A hex socket or box-end will do the job. The drain plug on the transaxle requires an allen wrench if you need that clue to keep from confusing one for the other. Don't bother the transaxle.
The oil filler cap on top of the engine camcover will say "oil", but the drain plug on the bottom of the sump never has any label on it. It's a big 17mm hex head bolt- it might be 19mm- use the wrench that fits snugly. Any wrench looseness might allow rounding of the bolthead an that will be troublesome until the bolt is replaced by a new one.
Before you go futher, get yourself a Chilton's or Hayne's auto repair manual for your car. At $25 it's a very good investement. Also get a large metal or plastic drain tub to catch the oil that will pour out the engine as soon as you take the drain plug out.
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