First and foremost, no reputable lender will ever approve you for a vehicle which exceeds 25% of your gross monthly income. You may be willing to pay $900 per month, but no bank will let you. Second, the fact that you have no bills now is irrelevant. A lender will simply assume that you pay rent/mortgage, or will by the end of your loan, and will take that into account. Finally, lenders look for no less than six months of uninterrupted full-time employment, and a verifiable income of no less than $1700-$2000 per month. Failure to meet minimum lending requirements will get you denied automatically.
On a side note, a car is not an investment, it's a depreciating asset.
Sorry, it's just not going to happen.
20 years retail auto sales experience.