This is not runescape. The rats don\'t carry money (sure, trust me

). You should loot their hide and eye by right-clicking on the corpse and click loot (the sac icon).
When you got somewhat 50 hides and eyes, go to the smith or the herbalist (on top of Kada El\'s, that\'s nearer to the exit of the sewers) or any other npc you can sell to. This will give you 350 tria... Enough to buy you a broadsword and some training. You could also kill 15 rats (105 tria), buy yourself a rock pick and start mining, a boring activity, but safe, and when you trained a bit it might get lucrative. Armour isn\'t implemented yet, but you can buy shields in Ojaveda.