The only consistent way to make cash is to train a gathering skill (ie: woodcutting, fishing, mining) there's no 'easy' way to make cash until higher levels (ie: GWD) and even then it's purely based on luck, so your best bet is train a primary skill.
If that's not the sort of answer you're looking for, continue training range at chaos druids or something and collect unid herbs to sell, when you're at a higher level move on to dragons and collect bones/hides.