found this in forums- being that your low level this might benefit you better then a endgame guide posted above.
didnt read this guide just skimmed thru it- only thing id reccomend is DO NOT MACRO abilities. but other then that it gives a decent breakdown for leveling i spose.

http://forum.square-enix.com/ffxiv/t...arrior-Tanking

their is an updated Xeno War guide to accommodate the 3.0 patch:
https://www.youtube.com/watch?v=HUXck-0vh5k