if you are a member kill dust devils, if not idk
Oh come on, we need more information than that! If you need EXP, then kill dust devils with a whip, as the above answer said, but for charms, your best bet at your level would be, like me, to kill Fire Giants. They drop one charm at a time, but they drop them quite frequently. They are very good EXP gainers, especially if you have a GS.