Question about Runescape Barrows?

I am wanting to train and make money by doing the Barrows minigame. I had some questions though. Apparently there is a maze of some sort under one of the barrows. Can someone please explain this to me. Also would I be able to kill all 6 at my levels right now. att 75 str 65 def 61 range 57 magic 72 prayer 58 slayer 51 (i was thinking about getting 55 for magic dart but my current task killerwatts kind of suck). what items should i bring also if i am ready. I have dragon legs, rune plate (sold dragon chain), drag med, SS, whip, d def, ddp++, obsidian shield (?), dragon boots, glory, ring of wealth, combat bracelet, bandos cloak. I have nooby combat gear but im a skiller. Thanks in advance.