In varrock by the palace as you walk round ( the same way that leads to varrock church - east side ) there is a "!" Symbol, that marks the palace sewers.
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To the southwest of the Varrock palace, look out on your minimap for a dungeon symbol (a red curved arrow). That points to a "manhole"; enter it.
you go into the kitchen sewers left of varrok palace and look there its different for each player it should say rusty key
You climb down the manhole east of Varrock Palace.
You can find these Hell Rats in the sewers in Varrock, You can find Varrock by exploring your map, have fun.
Osman can be found north of the palace in Al-Kharid.