Runescape Slayer Points and Cancelling Tasks Guide
Take care not to focus on points *too* much. Training slayer should be your priority when training slayer, as obvious as that might sound. There is advice floating around about using the Canifis master to get Slayer Points faster, and that seems ridiculous to me because Slayer Points are just intended to be a small bonus to slayer training, not something that takes over your training.
Even so, I'd suggest that you begin a streak and never end it. Instead of “Burthorpeing” tasks you don't like, simply permanently cancel them (100 points per task). Or, if you don't have enough points yet, or want to switch more than 5 tasks, spent 30 points to switch a single task. Therefore, there is no reason to ever do a task from Turael.
With your points, you should cancel 5 tasks, get the ability to make the slayer helmet, get the ability to make the slayer ring, and get the ability to deliver killing blows more quickly. All of these are important for slayer. The ability to fletch broad bolts and broad arrows you do not HAVE to get, but broad arrows are a common way for high leveled players to train fletching, although they are not my method of choice. I don’t suggest unlocking Aquanites, since they are a bad task, and I don’t suggest spending 2000 points to unlock ice strykewyrms unless you absolutely cannot complete the fight caves.