I want a xbox today and i have zero dollars how do i get it
You don't. Just because you want something does not entitle you to it.
Work, get money, buy it.Or ask your parents/friends.
One way that you can buy it is through saving some money aside, and you can decide to save weekly or monthly. You can also persuade someone to buy it for and you can find more tips here http://www.ehow.com/how_5837898_persuade-someone-buy-xbox-360.html.