Tips for getting/affording first car?

so l'm (19 M) very behind, i have no car, or any credit period, i live in upstate NY and im looking to get a affordable pre owned car, im working part time and make roughly 450/week, with the option of going full time, pretty much i catch rides with co workers, friends, and whoever or i take uber on the days i'm screwed, so that can eat into it some weeks. anyways i'm wondering if it would be in the realm of possibility for me to get a decent car + insurance with the money im making at this moment in time, and if anyone could point me in the direction of what to look for in a car so i know i won't get screwed with a car in terrible condition or a transmission ready to go or something. any help/advice is appreciated, thank you!