You can go into wow for keybindings, and either to "character specific bindings", or have a generic set for all toons.

If you go generic, then certain button positions will always have the same keybind, across all toons.
You'll still need to drag buttons into place, and such.



Most addons save their settings across the account.
For the ones that save on a per character basis, you can copy the Addon.LUA file from one character and paste into the next.
You can do the same, from one account that has been configured to another that has not.



I generally use the same keybinds as much as possible.
AoE stuff is on Shift A, for every team and Self buffs are on Shift D.
Targetable buffs are on Shift J and K, while group buffs are on Shift F6 and Shift F7.

I also look at a new composition, and decide where spells will be placed at maximum level.
So I can get used to my keybindings, as I level up.