Lets say I dualbox a Warrior along with a Paladin to level 70 (the Paladin is on the recruitet acount since I want to transfer him later on). What would be faster to get a level 70 Shaman and Rogue? Play a double Shaman team to level 60 + granting the Shaman on my regular account 10 levels + playing a Rogue to level 20 and granting him the left 50 levels I can grant OR should I just play Warrior and Paladin to level 70 and then make instance runs with the Shaman and the Rogue until they both hit level 55 and grant them each 15 levels so they hit level 70?
Greetings, ehrbaer

PS: Is there anywhere a guide how to make this instance thing?