You can grind Reputation Quests. I would suggest you to do Quests that you can do over and over again, instead of doing Daily Quests or Story Quests. :)
when you rank up in aq worlds you will learn a new skill and also increasing your stats including your hp but not your mp.
Rank 5
you have to be a warrior rank 10 and a healer rank rank 10
10
rank 10 doomwood
fight monster
I think it's ninja, if your a noob. But other good classes are shaman (rank 10 arcangrove), guardian (guardian verification), bard (mem and rank 4 mythsong), paladin (mem and rank 10 healer and warrior), ranger (rank 10 sandsea), doomknight (mem), dragonlord (dragonlord verification) requirments are in the parentheses.
you can't you need to work hard for it.
by cheating
by doing quests from shadowfall leader person
Get rank 10 warrior and rank 10 healer. Then go to artix in the inn at swordhaven.
if you are evil and whant a good rank you go to the king and buy a good reputation if you are nomad you choose it at chapter 2