DO NOT FINANCE A CAR when you have no credit. You'll pay an absurdly high interest rate for it and you'll soon owe more than the car is worth. Pay cash only, and don't forget to factor in the cost of registration and insurance.
And for Christ's sake, find someone knowledgeable who can fully and properly evaluate a used car for you. Appearance can be very deceiving, so you really know what to look for mechanically. If you don't know anyone (an older adult of course) then it's worth paying a hundred or so to have an independent garage inspect and test drive any car you are seriously considering. If you don't you'll be sorry.
And never trust a seller, especially a dealer. Most salesman are so hungry to make a sale they're not going to be telling everything you should know about the condition of a car. In the used car business it's "buyer beware". If they don't outright lie to you, they will at least stay silent on the matter and hope you don't find the problems yourself.
I'd recommend buying from a private owner, not a dealership who will charge higher prices. Look in the most affluent neighborhoods, preferably where there are a lot of retirees. Try to buy from an older adult or retired person because their cars tend to be better cared for and driven more gently. Never buy a car owned or driven by a teenager, so you should also avoid buying from a family with teens / young 20's in the house.
Bottom line. Pay cash, check insurance rates first, and get help evaluating.
And DON'T BE IN A BUSTING HURRY to buy. Rushed decisions are rarely good decisions.