1) Always look for RB parties in /partymatching, regular farm is a joke
2) On 25 do the 'Moon Knight' quest (taken in Gludin), it gives you free D armor
3) Try to get Othell rune in your weapon as soon as possible - level 1 Othell rune gives you flat +75 crit rate which is insane for farm.
4) Don't waste you XP scrolls on normal farm, save them for RBs
5) You can do the 'quest mania' easily on accept/abort quest such as this one - just go to NPC, take the quest, say that you quit, then take the quest again and say that you quit again. This way you can get free XP scroll every day. On later levels (55+), this one is most popular, you always see bunch of people around the NPC in Aden warehouse.
btw. tyrant is an excellent choice, it's one of the strongest chars on this chronicle, both PvE and PvP.