This guide basically covers the recommended requirements, but you do not have to be a pure to put the 0wn4g3 on fellow players....
Your attack and defense should be equal, if it is a freeplayer, 40 is where you should stop.
Once your attack and defense is 40/60 (mem) you should train strength to at least 10 levels above attack + defense. while training strength train prayer to 43. (really easy with hill giants, dragons BIG advantage)
Your ranged can vary, but i recommend 50+. Mage should be 10 levels above strength.
What to wear: The best cape, boots, and gloves available to you. Prayer enhancing armor such as initiate. Power/glory/holy amulet.
What to bring: at least 8 swordfish/sharks. bow + arrows. Teleport runes/ring of life/dueling ring. runes for blast spells/entangle/snare/bind. (the bow, arrows, and runes substitute for each other) i got two accounts like this, all dependent with runes and money for starting on my main. 7m on one now and bout 2,3m on the other. pking rocks.