Help me get back on my feet

I'm a single mother to a beautiful little boy. I have not had a vehicle for a year and no longer have a sitter for my son, thus making it that I lost one of my jobs and cannot work my other job. I am currently looking for a day job, a daycare, and a cheap car. I have saved up $400, so far for a car, but obviously that won't buy a very safe or reliable car. I need a new car in order to take my son to daycare and hopefully a new job since daycare is not open at night and I don't have someone I trust to take care of my son. Thank you! Anything helps!