Crafting to 99 with bowstrings = profit. Go some quests for 35 Smithing (or around there) and do Cannon balls until a high level. Then use profit from making Cannon balls for 99 Smithing. 99 Herblore I would recommend making combat potions. I used those for 96 and it cost me 90M or so. 99 Agility I can't help.