I’d recommend capital one auto navigator, the credit karma scores are trash (vantage scores) I’d go to Experian and get my 3 scores from them for a dollar and a 1 week trial. If you are looking for pre owned try out carvana (they actually use the vantage score unlike most lenders) and they can deliver the vehicle if you like.
Other options are local credit unions.
https://www.capitalone.com/cars/prequalify/You can prequalify with Cap1 and carvana with no impact till you find what you want. They’ll give you the apr, max terms and any down payment needed.
Edit: Usaa doesn’t always give the best rate, they use FICO 3 which is an older version used for credit card lending too. If you have never had an auto loan I’d imagine you would have low auto enhanced score if any at all? So for your first I definitely recommend the routes above.