civic heater

i'm having trouble with the heater in my car, when i turn on the heat it only come out cold air. also, the lighting in the climate control isnt on when i turn on my headlights. anyone knows what is wrong with it? does the condenser fan has anything to do with the heater coz it isnt running when i turn on my AC but i try hooking it up to the battery it works. I also read some of the post on here, i heard about something my the thermostat? what is that? i have a 95 honda civic 4d lx. please help me.