i have already found a car i want, can i get a loan through you and use it at any dealership or only dealerships you work with.

What you want is a Blank Check Auto Loan. You will be able to write a check to the dealer up to the approved amount, and it gets treated as cash. Your loan will then be at the terms agreed upon earlier, and for the amount you ultimately write the check for. This is usually a better option than letting the dealer get you financing. If the dealer can do better, you have the option to not use the check at all.