Needing help with brakes for Ford Ranger!?

I have a 1994 Ford Ranger. I have little to no problems with it up until now. It seems as though my brakes are sticking. Most of the time, when I depress my brakes, my park brake light comes on and stays on. I get horrible gas mileage while this light is on, which leads me to believe that the brake is somehow sticking. They also squeal rather loudly. I just replaced the brakes recently. Also, when slowing down, my breaks sometimes seem to, "lock up," and my truck just slides really badly. I am worried that this is going to be a serious issue. I don't have a lot of money to invest in this. Anybody have any idea what this is and how can I fix it?
 
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