First select a car of your choice ie type of use & budget, you can do this by visiting showrooms or through net as in yahoo.automobiles. Also check out the promotions (at present the summer offers and later on the Ramadan offers) being advertised in newspapers; once you have decided on the vehicle, approach the showroom representative for the loan.
Most banks have a representative visiting the showrooms and the sales executive there (if not one with a bloated ego) will be everso helpful to arrange your finance by any means; so whatever is your credit worthiness, you will have atleast one bank ready for a loan.