A word of advice to go along with all the advice you've been given. If you decide to go magic for your main class, doesn't matter if it's acn, thm, or cnj. Go through thm up to level 26. This gets you probably one of the best abilities for any magic user, swiftcast. As the name states, you can cast one spell after using it without any cast timer and it is incredibly useful. acn can use this to summon their pets extremely quickly or rez quickly. For healers... well the usage should be obvious.