do i rlly need all the qs and skills for start the dessert treasure ? cuz my range/mage need the ghostly robes... plzz help me =D

Yes although i think you can pot to get to the lvls needed. Although high theiving is always good for DT

you have to have all te quests done, or you can't even start DT. And if you don't have the skills, then you can't do complete the quest. Although you probably could pot, but it would just be easier to get the lvls, the hardest lvl to get for it is the theiving, but even that isn't that bad.

Well if you're just looking to get the Ghostly Robes you only need the requirements to start the quest. Don't worry about defeating any of the 'bosses'. You will need 53+ thieving though.

its cuz im a range / mage pure and waterfall quests give alot of att and stre exp?

Yes, it is. Just do as everyone have said and you will clear the quest excellent :) .