No, you wouldn't be considered a first-time car buyer, since you have previously taken out two auto loans and you bought the Dodge Charger on your own.
No, you definitely won’t be considered a first-timer. They would look at even the cosign. But that doesn’t matter because you had a loan in your name anyway.
As for what rate to expect, it’s hard to say without knowing what your score/credit will look like at the time. But you got yourself a 4.75 once, which is decent. So I wouldn’t expect anything too high.
Enjoy that new Jeep! I saw a Gladiator yesterday and thought it was pretty cool! Is it a truck? Is it a Jeep? Who knows but it looks good.