Likely the fastest option is to first level a Mage+Healer duo and then master a single Mage's Blizzard Kiting style and power level your alts. You can learn more about this from
Arlaeus's YouTube channel.
If sticking to duos to me healing & rez's are one of the limiting factors so I would want to pair them where-ever possible and maybe start with the combos that have unlimited rez's to give the most forgiving options early. I would also want to get myself free food/water ASAP if trying to do all classes so with that in mind I would likely go with the following duos:
Mage+Priest (starts with free water/food & then available for the rest of the duos);
Warrior+Shaman (warriors get the most from totems);
Rogue+Druid (duo stealth option);
Warlock+Hunter (pet classes are the easiest to run without a healer;
The only one that really would matter to me order-wise in the above list would be to do Mage first to give all the pairs free water/food.
You could run the Hunter+Warlock next and then use the Warlock to give the rest of the duos healthstones and a soulstone. If I recall correctly you can only give out one soulstone at a time per warlock & would want your rez'er to have it so likely you would want the Warlock opposite your "healer-pet" account.
I debated on pairing the Rogue with the Shaman and the Druid with the Warrior but in the end felt it was best to have duo stealth.
Best of luck to you.
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