Ok, for the targeting problem theres a few macros that are easy to make and use to follow idk if you already have them and there not working or something because they are working fine for me. Now do not copy and paste i am doing this from memory.for the sake of demonstration i am gonna use playera-playere, thats 5 players total. Ok so i would guess your leading with your pally so we'll call him playera.
basic macro for alll toons is /focus playera very simple macro. now for your targeting issue, for all your casts you will use
/cast [target=focustarget] (spell here). and that clears taht problem. And i actually just figured out how to do the heal one yesterday and its pretty good if all your mobs are beating on one guy, if there are multiple mobs beating on all your party members, then this macro=fail lol
/cast [target=focustargettarget] (healing spel here)
if you have all those macrso set up you should be golden!
GL :thumbsup: