I would train prayer to 43 (protect from melee) and get your attack to 65 and your strength to 60 and use a Dragon Dagger(p++) and PK people in the wilderness
You can obtain the cannon ball mold from Nudolin on the Ice Mountain (between Falador and Barbarian Village) and the ores might take you a while depending on your mining level
It depends if you would rather Dragon weapons or a Granite Maul. In my opinion you need the strength more than the attack so train strength would be my advice