Pretty simple, add up all the money you have made last year and figure approx 25-30% will need to be paid to taxes. A good accountant can drop that figure a bit, but thats a good place to start. Based on some of your posts I will guess that you don't have a penny saved for taxes and you spent all your income on childish things like a car and partying? so you will most likely be fucked...
But you will be able to make a payment plan with Uncle Sam as he loves to add on interest and penalties to the principal you don't even have.