Get some lvl 1 abilities for all other classes then go to POTD and try the play styles out, if you find one you like enough to level go for it, if not, then continue progressing with your WAR. POTD is not going to teach you how to use the abilities but it will give you a small taste of all jobs. That way you are not investing multiple ours running around killing stuff just to level up. I tried it and honestly after I got my very basic gear/armor etc I ran as WHM and BLM all the way to floor 50 without needing to gear up at all. Ended with level 15-16 on each then decided I hate how slow the casting was. I did enjoy lvling DRK tho and now I am going to level that job a bit further out in real content.