1996 Mazda 626 2 problems

1996 Mazda 626 6 cyl Automatic

ok I have a weird problem going on with my mazda. I dont know much at all about cars but dont want to spend a whole lot of money fixing it since its on its way out. Anyway the other day I had my lights on, pulled inthe garage turned them and everything off for a couple of hours. When I went back out to the car the lights would not come back on. The brights come on only if you pull back on the light switch thing but if you push it forward to leave the brights on those dont work either so now I have to hold the light switch back when I drive at night so the brights are on. How could I fix this problem?
number 2---my air conditioner doesnt blow out cold air anymore. It blows air but its hot. Do I just need to put that gas that comes in a can in it or do I need a lot more work. Please help me