Stick to full rune with whip or you can buy torags, train def on ogres/trolls/ghouls, and then you can use dharocks for str if you want. Another great way is pest control.
Fishing Lobs and selling them is a decent money but gets boring. Try rune merchanting, go to mage guild or whereever, buy runes, hop worlds, buy runes, repeat, and when you think you bought enough, sell to people.