bad motor

Was driving down the road going 45Mph when I noticed problems when shifting into 3rd gear. When I look at the dash the oil pressure guage was reading 0 and the Check guage light was on. As I went a little down the road the engine stop and now will not start again. When I start it I hear 1 Click...

I have an 04 ranger 2.3l 5 speed manual 2wd and it had an oil leak and I let my sister use it and she ran it out of oil so now I got a knock in the motor(one of the pistons are hitting the head) ... I'm looking to sell it. It is my first truck so I really don't want to but I just lost my job and...