Why is my engine sound like its missing?

I just got home from work and my check engine light just came on and I have read a little bit on it and so far I got that it is most like the thermostat that needs to be replaced but im unsure. I mean Im not sure if its just the thermostat, then should it be sounding weird too and my gauge inside the car isnt telling me that its overheating. Shouldnt that be telling me that its getting too hot or too cold? And also is it okay if I drive it to the parts store and school until I can fix it?