Get atleast 70 prayer and get 94 mage. Then you can pk.
I suggest 99 Strength also.
P.s, 70 Prayer would take 30 mins, and would cost 11M with frost dragon bones, its worth it though..
Tbh, I would not train your str, keep it level with your other combat skills, but I would suggest getting your total up, maybe all skills above 60, and I personally like Herblore and Magic so I would raise those two...get barrage