what are my odds of approval?

there’s an 09 miata i’d like to finance. it’s $13,987, it has 57k miles, a clean title, & two previous owners.

i’m 19, my credit score is about 730-740, credit history 10-12 months, i’m making about $45k/yr, about $600 worth of debt, (self credit building loan), & i’ve got about $1k ready for a down payment. also take to not that i already got prequalified from a CU for an $18k loan, with about 9% apr as a first time buyer.

also, i’ve never really had a proper role model in my life, so if this is a stupid decision, please let me know kindly with proper alternative advice.