Alright, before you start training, get Adamant Gloves (it keeps 1 defence, plus the prayer bonus) and do all the pure quests you need to do before you train (guide on pure quests can be found in the Runescape guide section)
Then you'll want either 60 attack for D Scimmy, or 70 attack for Whip ( I suggest whip because in the long run you'll find it better )
Then you'll want 85+ Strength, for the hits, obviously 99 is the best.
1 Defence is kept.
82+ Magic, and Desert Treasure, for Ice Blitz (94 Mage best for Barrage)
80+ Ranging, incase you which to hybrid, using Rune C'Bow and Dragon Bolts (E)
52 Prayer for Smite
And PK.