Brody's guide that Dei Wei linked to. 'nuff said. You might want to RS gold play with the setup he provides though; such as bringing a Verac's skirt for prayer bonus and array defence, or some other Barrow's legs just for array defence. You might also need to bring a shield to compensate for a low defence level. Attempt to get a SGS donate in the event you cannot be bothered getting an Improved Excalibur at least.
You will also want more brews to compensate for inexperience till you get the hang of it. If you're using a mixture of prayer and super restores, only use super restores after you have brewed.
Don't forget to learn how to lure correctly and what to do when you reach Jad... Because it would suck to get KOed before you even watch him in your display. Watch a few video guides on prayer switching (which have in-game audio included) - that helps the maximum for Jad if you have never been before. Use your 1m in bolts/arrows for to 70 range before you consider it though.
What are your stats tho? You should not do it much under 90 battle, as they'll mess you, and you'd barely make any money (even in lvl95, last time I tried, it ended at a loss for me, as the pray pots+food cost over the loot). I'm a noob. My complete level is just 437. I don't understand how to look up my aggregate combat level, but my Attack is 32, Strength 15, Defence 23, Ranged 6, Prayer 20, Magic 49. Yeah, totally unbalanced.
Once I started playing, I wanted to be a strong mage, so that's where I put the majority of my effort. The only reason my attack is as high as it is is because I like to beat up bears and unicorns with my bare hands and no armor. Look at that silly noob beating up that endure with his bare hands and no armor! Anyhow, I just wanted to know how to acquire unique places. I just like to buy RuneScape gold go exploring, sometimes. I didn't need so much for to the barrows especially, how to get beyond that dog that protects that tunnel under that temple so I could explore everything east of Varrock.