As a god, it would be my responsibility not to destroy the universal balance; thus, I am unable to just appear instantly. I would need to "convert" them to being open minded about other gods and then I will appear. I will give out my 3 main rules:
1.Do not harm any living thing, if you break this rule, I will break your skull.
2.Do not act in violence of any form.
3.Don't be a stuffhead.
I would try to act with any other gods out there, such as if Gaia was real, I would let her take care of her creations, and her earth. I would let Zeus and Poseidon make the hurricanes and earthquakes, and I would let Hades rule the energy of darkness.
I would be sure to "Educate" them on solar/wind/water powered technology.