Welcome back.

Firstly, an important thing to keep in mind: After you hit... level 10 or 15? You can change classes and jobs any time you want. If you're just curious, want to experiment, or maybe even your first choice isn't what you hoped it would be... change & change back any time you want.

As far as class paths go, typically it's class -> secondary class -> job. For example, to unlock Warrior (job), you would get Marauder to 30 and Gladiator to 15 (the order doesn't actually matter), and then do the Warrior quest. Typically you want to do this as soon as you're 30.

There are other considerations for cross class skills. For example, although gladiator to 15 is the minimum, taking it to 22 gives you provoke, a very important tank skill.

Feel free to ask away with any other questions, and good luck!