Archer:

I suggest getting plvled to about lvl 70 if possible.
After lvl 70 id say go to lab 1 until about 100-105.
Most people after that tend to just go to Advance Map to lvl the rest.

Warrior:

Once again if possible get plvled to about lvl 70.
If you already have good gear you should be set to go lvl in Desert City first map till about lvl 82-87.
Dependin on how good your gear is at lvl 82 you may be able to go straight to Bird Island and fight Birdmen.
Lvl there till about 97-100 and then move on to lab 1 till 110. Its possible to go from 110-117 in Lab 2 but most go to lab 3 after 115. Your choice but lets say Lab 3 115-120 and then Lab 4 for the rest.

Trojan:

Basically the same as a warrior, you wont have as much defense so you will have to be a little bit more careful but im sure if you got good gear and half a brain you will succeed.

Fire Tao:

Most get plvled to 70+, most even get plvled to 110-120 if someone is willing or if they have an archer to do it themselves.
If not then take your tao out to Alien Apes and start walking around using Fire Circle or watever. Not sure what else to do with a fire, but im sure people will leave more guides.

Water Tao-

Well get plvled till watever lvl u want it then reborn it.