Yes
5w-40 fully synthetic
avoid fully synthetic oil use semi
10w-40 fully synthetic or 0w-40 fully synthetic are most popular
dexron 3 replaces dexron 2, so you could mix them but the dexron 3 is better
Try an auto parts store. Dextron II may be replaced with Dextron III.
You'll need to flush out the transmission cooler as there's a technical service bulletin on this and install Dextron 6 along with a new filter. This is a synthetic fluid that's compatible with your car and solves the problems with Dextron 3.
All major brands of full synthetic are good.
We have Camry 99 with automatic transmission and it requires transmission liquid Dextron 2 or Dextron 3.
It is not required. You can use conventional or synthetic oil.
Yes, Dexron 3 is just the newest version of Dexron 2 and they are interchangable in most cases, but not all...for example old Supra's need Dextron 2 or the autobox makes a buzzing sound at idle, so check first.
Yes. Marvel mystery oil is fully compatible with synthetic oil.