Candela I admire your pluck and courage to want to do something so difficult. But I am DEEPLY concerned that you don't know what you don't know, and therein lies the problem.
It does not necessarily make it easier to work with a temporary DNI. most employers, services, banks , etc don't want to be bothered making sure you've been renewed or keeping track. It just makes it legal for you to work. And since so many here work under the table, this isn't the greatest of your problems. Your age is a big problem along with your lack of permanent residency, university education, full time work experience. You will be competing against a pool of no hassle already legal, educated and experienced and more mature (age only!)natives and or permanent residents. The odds are not in your favor.. I would strongly suggest you put this off for a while to gain some competitiveness and then try.
Meanwhile cant these contacts that you've made on your numerous trips here already help you find something? Or what about the time honored nanny routine? At least you'd be supported while seeing if ARG is really what you want....best of luck