For Range I would recommend Completing the Dwarf Cannon quest, and then throwing knives at Rock Crabs while cannoning them until around 50-61 Range, then get yourself a Crossbow and some Mith Bolts, and kill the Tzhaar creatures (whilst having them lured behind vents) if that is still possible, if not Fire Giants in the Waterfall (Waterfall Quest requirement) there is a safe spot near the door in the west passageway. Once you've reached 70-75 range use Red-Chinchompas on mummies in the chaos tunnels, you may want to look up a guide for this.
For Magic, I would recommend using offensive spells until the Lumbridge teleport, then use the Lumbridge Teleport constantly to reach Superheat Item (43 I believe) do superheat item until you can teleport to camelot, then use the Camelot teleport until you can do the Fire Spell at level 59 I believe it's Fire Blast, use Fire Blast (ideally on a friend in duel arena) til you can Ice Burst, from there you can burst mummies or rock lobsters until 80.