Ive been double boxing pallies for awhile now and the way that i did it was i matched their buffs and had them cast a different blessing on each other. Example: My main casts Wisdom on my slave and my slave casts might on him all with one key stroke. The second key stroke has my main putting Wisdom on himself and my slave putting might on himself. Recently though i got Greater blessings and because i box only one class i rolled all my buffs into a single button.

For you i suggest you wait till you get higher lvl and your pally gets blessings as well. Complicated macros are never fun to make and less fun to try to fix. One good way of how you could make your buff sequence would be to have your druid buff your pally with mark and you pally buff the druid with wis/might (pending spec) and then on a second keystroke have your pally and druid both buff themselves.