So I recently got a used 2006 Cobalt SS nothing but problems after like 2 weeks

So my car wont start for some reason I looked over the basics but not sure what it is.
If I turn the ignition on it kinda start then it idles rough shuts off and wont do anything after that. Attempting to turn it on but the electronics seem to go all janky like it'll show the temperature out side at like -40 degrees when its like 80 outside and it keeps resetting my oil life for some reason as well but right now it seems like it wont be starting off at all.
At least I am at school making some time useful but anyone have any idea what it could be??