Send tells based on who's online within a list?

[guice]

With the addon whisper cast, many of my guildmates have setup whispers for their buffs (esp paladins).

I'm wondering how would I go about setting up a macro that will go through multiple lists of paladins (hard coded) and send a tell to the first one it finds. I'd like to have multiple lists in the same macro.

For example:

list = ('pally1', 'pally4');
list2 = ('pally2', 'pally3');

for pally in ( list1 )
  if online(pally) 
    /tell wisdom
    last;
end;

for pally in ( list2 )
  if online(pally) 
    /tell kings
    last;
end;

How would I setup a LUA macro for this? Sadly, just hadn't had the time to read up on the LUA language and WoW API.