lock system

What is your question?

my lock on the driver side is completly broken and the key remote doesnt work either. to get in the car i have to open it from the inside. on top of that my headlights arent working... which happened soon after my key and alarm system went. are they connected? and how much will fixing the lock system run me? last time my alarm was acting up i couldnt get into my trunk, i replaced the battery and everything began to work fine , well untill this all happened.