So you need some kind of help with some kind of car that has some kind of stereo.
Good luck with that.
What year model car is helpful. What time of day you stopped for gas, not so much.
To the OP. Frankly, these girls can have a LOT of problems, depending on their history. This may not be an easy fix, IE it might have several problems. If you can learn to deal with wiring you can work through it. Otherwise, a "local helper" would be a good idea