The Slayer Helm is acquired after the completion of Smoking Kills from Skyzhay's blog

Some information An cheap OSRS gold important note: The Slayer Helm is acquired after the completion of Smoking Kills, a quest I highly recommend you complete before starting Slayer seriously. When you earn 400 Slayer Points for completing tasks. The best method to earn points is to complete Mazchna's task in tasks 1-9. Then, the most difficult Slayer Master's task for task 10. I'd recommend doing Slug Menace for Proselyte and RFD for Barrows Gloves. Always utilize offensive prayers on every task to get faster kills. The money you earn is likely to be more than you can afford. You can do Farm Runs in order to decrease the loss gap, which will go away after a few farm run that day.

Like they've mentioned before it is a fighter torso that is the ideal choice, and you can use it right now if you were to acquire it. For the legs, personally I like Verac's skirt because of its prayer bonus (and its manliness). Even if you don't pray for the entire task, you might as well utilize your base prayer points to build up superhuman strength (+10 percent strength for the first part of your job is good) and the bonus prayer makes it even more effective.

The super sets, powerful attack and strength is a must for any task, but super defenses you might want to bring in case you notice that you're being hit often on a particular task. In all cases, super defenses are very cost-effective compared with other sets and the only thing that is wrong their use of up inventory space.

Another thing you can purchase old school runescape gold is a DDS to match your specific weapon (if you haven't). It's not expensive, and comes with a powerful offensive feature that will make your task easier (if any way it gives you the satisfaction of getting two good stacked hit).