I'm glad to hear you're going forward with Marauder! Warrior job best job! Once you hit 30, you can do the quest to get your chocobo to fight along side you. If you set their skill tree as healer, you'll be set for anything the game. The further you get, the more you'll get self heals to take advantage of, too.

Remember to use all your attribute points on strength! You'll be tempted to use them on VIT for tankiness but strength gives you what you need, your gear has the VIT.