+1 to that^
But this is my own way of leveling from Acolyte to Champ:
Use heal to kill undeads in pay_dun00, you can go to pay_dun01 next if you feel like the exp you're getting isn't enough anymore
Around base level 40, switch to Glast Heim underground prison 1 (free access without vip in warper) for bigger exp, heal the undeads until you reach job lvl 50 then change job to monk
After you change job, you can either stick in glast heim or go to mosk_dun01 to kill Les (change build to str agi dex) don't forget to put points in Triple Attack (monk/champ's skill) as this passive skill will boost your attacks.
If you choose to kill Les from that point, make sure to collect sharp leaves, you can turn them in for exp in um_fiid01 (need at least 50 sharp leaves every turn in) NPC located near at the upper left portal of the map
You can do that until you reach lvl 80, but if you choose staying in glast heim to heal the undeads, then no problem too! After reaching level 80, you can do satan quest to get access in sograt 21 for free leech. Sometimes there are star gladiators who are farming there that give free leech just to boost their damage! (Their passive, let's not get deep with this one)
Alternative: When you reach level 80, you should have enough points for Asura Strike, from then on you can Asura Strike Anubis in sphinx 4 to gain more exp until you reach level 99. (Make sure to change stats that will fit for asura strike build)
From there, you can finally rebirth and start anew. Then just repeat the process until you reach level 99 champ!
This is a long *ss guide, but if you managed to finish reading this then congratulations!
Hope this helps >< Happy leveling!
I can help you in game too ^-^ If I'm online, that is.