Skills:

First job advancement
Max slash blast and the mobbing one (forgot its name) as soon as possible. These are useful skills throughout the game. Then divide up your points and put them on hp recovery and hp gained per level. The hp gained from level is very important, especialy if you want to be a health warrior.
(More will be added)

Hunting grounds:
Ariant is a perfect place to hunt for level 20-40 warriors. It has high level monsters that give good exp, but dont have to much defence, making it easy to hit them even with low accuracy. (more will be added)

PQ:
As a warrior, you probably will have low accuracy, making it hard to hunt monsters higher level then you. Party quests are also hard, as they generally have monsters like that.
Boss fights are also hard, because they have high avoidability. I recomend KPQ at level 26+, so you can solo king slime and so you can hit evil eyes. Take advantage of the easy moon bunny quest when your a low level, because at higher levels the experience you gain from it is not much at all.
(More will be added)

Bosses:
Bosses will start out hard, because you wont be able to hit them. But once you reach a higher level, you will be able to easily kill bosses, doing massive damage to them. (more will be added)

Fighting:
Take advantage of your high health and good mobbing skill. As a warrior, you have little need to care about health, and can jump into a swarm of monsters and fight them all. (more will be added)

I'm gonig to update this guide as I level up. I'm a noob. My highest character is 37. But as I go along, I will edit this to make it more efficient and helpful.