Auto Loan ?

I'm 17 and I'm taking out a 5000 auto loan *with a cosigner of course* . Is there a certain amount of money i need in my bank account. I have a job making about 300-500 a month *depending on how my tips go*. So how much should i have in my account when i go to get the loan? someone told me at least 3 payments?

 

Finance your car here onsite if you need help buying one of these beauties :)