Hello fellow Eorzeans!

I started playing a few weeks ago on the free trial, and this week decided to buy the game after enjoying what I've played through so far. My current and only character is a level 27 gladiator. I haven't leveled any other jobs yet.

My question is simple: What's the recommended way to level other jobs besides the one you started out with? I really want to reach level 50 quickly so I can glamour items—I'm a huge stickler when it comes to weapon/armor appearance—but I also know that there are classes you can "upgrade" into if you've leveled other jobs (i.e. paladin at gladiator level 30 + conjuror level 15).

So, being almost level 30 as a gladiator, should I then stop and level a conjuror to 15 so I can unlock paladin? How should I go about leveling other jobs if I've already advanced my MSQ to the early 20s? Should I just find appropriate level levequests and spam them?

Thanks for your time! Any advice at all is greatly appreciated.