One of the biggest appeals of FF14 is that unlike the majority of other MMO's you only NEED 1 character, as it can play every class including crafts. I found it very helpful when I first started was I unlocked every class as I went to each city, including crafts. and leveled all combat classes to 15. You learn a lot about different game mechanics, and you get a lot of information that helps you figure out what to do next. This gives you access to amazing cross class skills to use while you level up your classes. Another thing is that you will, once you start doing endgame, need quelling strikes eventually so keep in mind that one day you will need to take you archer to lvl 32. I also noticed when lvling up until around 44 you have an excess of missions(assuming you do a couple repeats of dungeons to make sure your gear is staying up to date) which can be used to help level your subclass/alt job. Don;t forget guildheist either the One time bonus is a great boost for making xp and gil.