You need to get your Runecrafting up. Once you can make nature runes, you can make VERY good money from it.
also, don't be scared of the Barrows, it's actually REALLY REALLY easy.
I recomend using Slayer Dart, I don't remeber if you need 55 or 50 slayer
At the Barrows. You want to Range Arhims, Mage the 4 meleers, and Mage or Melee Karil with a slash weapon, your whip would work great.
ALWAYS start with Dharock at the barrows, He's the north east mound. then move to Arhims and Karil. The last 3 are your choice.
If Dharock is in the tunnel, you can actually do trips with out using Prayer Potions, the tunnel has a lot of safe spots to mage from.