I've seen a few articles about how to lvl a fire but I thought I'd share with you guys how I lvled my fire.

Lvl 1-40

You could do the quest at TC. If you max out the limit of taking the quest, you could get to lvl 19 in a day. Then the next day, max out the quest and you should be at around lvl 27-29. Don't go to PC and do the quest. It will be hard for taos to kill 300, i swear. Instead, go to Bird Island and find a plvling archer and get plvled to 40.

~Don't get plvled too much or you will be piled up with too much skills to lvl.

Lvl 41-80

The best place to lvl as a tao is Waterfall Cave. There are lots of safe places to sit and zap the bats.

[To go there, you must enter the portal at the top right corner of Phoenix Castle Map and then in the next map, which has the Hawkings, go to the top right portal again. then in the next map, which has Bandit97, go to the bottom center portal.]

So you start zapping there till you get your thunder fixed and you get fire. This place should do you good till you get Fire Circle[FC] which is at lvl 65. FC in TG a night and it should lvl. You could also go to DC to lvl your FC but it the mobs there would really hurt your HP. The rest of your skills, you could lvl it at Waterfall Cave. Lvl your fire here till you get tornado.

Lvl 71-90

At lvl 80, you start to go AZ. Get Bomb. You need to stroll around market, i think, to get this. You should have at least unique/elites to go here so the monsters here won't do you much damage. Go to Guild Conductress and have you teleported there. [It's different in all servers, so ask anyone what GC AZ is.] Usually, it teleports you to the Serpents area, these are too high for you. So you go to the next map through the portal at the top right. Huge Apes shouldn't do much dmg since they do magic attacks so here you could just walk and FCing the mobs. Do this till they are green to you which will be around lvl 85-88. Get Fire Of Hell and then go to the other side of the map, the Senior Apes, cast FoH for it to lvl. here, you could lvl your nado and all other skills without the fear of getting hit hard.

Lvl 91-125

At lvl 92, you start to hit the Senior Snakeman. and at 103, move back to the 1st map, and hit Serpents. It would be really wise to team up with an archer and start a stack so that he will lure the mobs to you and you hit them all with FC. You will get really huge exp but you need lots of Mana and full durability so that you won't have to run back to TC that much for repairs and pots. You need to at least have a lot of Elites and a few Supers. So that every mob in the map will hit you 0. So by 107, you start hitting on Senior Serpent. And by 112, Alien Serpents. And by 117, Basilisk or you start going to Wine Zone. [NOTE: NEVER FORGET to lvl your nado and other skills. You need to hit Black-named mobs to get better skill exp and try to get a 2soc BS with 2 Super/Ref Moon Gems.[Wine Zone is at Mystic Castle, you can only get there when you give the Alcoholic a Health Wine] Wine Zone will do you good till about 123 or something like that.

Lvl 125-130

Do the quest at Cloud Saint at Market. Should be easy with Fire Circle.
I hope I helped. :D