Without boosting, 1 to 60, quests is probably your fastest leveling.
With boosting, instances better this, but without a higher level that's not an option.

Gold can be a serious issue on a server without a higher toon.
Some consider purchasing gold, but this is a bad idea and likely to cost you your accounts.
Gathering skills will slow your progress, but that's probably the best gold maker with new toons on a new server.

Give your primary toon mining/herbalism, because you cannot macro either and will need to manually click the resource nodes.
Give one of your alts skinning, because you can easily macro this...
.. /targetlastenemy
.. /use skinning(master)

The skinning skill needs to be the same as appears in the general tab of your abilities page (P default short cut).

It is probably worthwhile to include tailoring/enchanting on one of your toons as well, because you will be able to disenchant instance drops for a good source of income.
Auction house the shards/dust and the skins/herbs/minerals; have an auction mule that does all of your selling and never leaves the AH/Mailbox area.
Tailoring will cost you cloth, but most of the stuff can be disenchanted, and in Wrath a tailor gets bonus cloth on looted mobs.





Jamba has a follow command, which I've bound to G18 but you can bind to whatever keybind you like in WoW.
The command is something like... /jamba followmaster all. You could get the exact command from the Jamba documentation or somewhere in that thread.
It doesn't matter if all toons spam the macro, because they are each telling all toons with the "all" tag to follow the master. By default I believe every toon is in the group "all".

Other tags can be worthwhile. Any class that is unique should have their own tag.
You could have the paladin buy symbol of kings from the reagent vendor, based on being in the group Pal and members of that group buying the reagent until they have 400 of it.
Very nice feature for Jamba, cannot recommend the addon highly enough. It makes boxing 20x easier.





For fastest leveling with RAF...
Take all the kill quests and kill things.

Most collection/gathering quests are a waste of time, but it doesn't hurt to take those you're not familiar with.
If the drop rate sucks, abandon the quest.
If you need to kill 20 kobolds and collect 10 candles, see how many candles you have after the kills are done.
Most collection quests aren't worthwhile, but you could either skip them all, or collect on one toon only and rotate which toon does the collection.

Until Outland, there are multiple zones for leveling up.
From an alliance perspective you could do the Human, Draenei and Night Elf quests.
Progress to Westfall, Auberdine, Loch Modan quests.
Progress to Redridge, Duskwood, Wetlands quests.
Only do the quests that are kill stuff, and for the most part because of RAF you'll finish each level range very quickly compared to single-box non-RAF.
In Outland, you pretty much have 1 zone for each range, but can also instance. There are plenty of quests to easily level even without many collection types especially now that we need only 2/3rds exp per level 61-70.