The road to 60 buff is given when you create character or transferred into preferred world.. If your question is how to get the buff then you must transfer..
If your question is how to level up the easiest way is to grind lv 51-60 palace of the death (the best and most boring exp grind to lvl up til 50).
Post Lv 50 would be easier if you do daily hunt, daily beast tribe, daily roulette and dungeons..

You can get extra exp from eating food and joining free company for extra exp buff..