Car was driving.. It kept idling up and down..I turned it off and when I tried to turn it back on it wouldn't start or if it did it would constantly act like it was going to start then stop...

The weird humming and click when trying to start the vehicle sounds like a concern with the starting system first off. Have the battery checked for state of charge and the ability to sustain a load first. Resolve that issue before moving forward. As far as idling up and down and hard starting - if the battery concern is resolved and the vehicle is still not working properly, then diagnostic testing related to engine performance is needed. The fuel delivery, ignition spark, air intake, emissions controls, engine compression and timing may be in question. Hands on testing with proper test equipment and shop manual for reference is needed. www.repairpal.com/repair-shops