Won't start

I own a 1999 Dakota with a 3.9 V-6. The truck has 88k miles. The lights were left on and drained the battery. We attempted to jump start, engine spins but no fire.I then charged batt. For a couple hours on the truck. Engine spins fine but still no fire. I left the key in the on position and noticed that the odometer flashed 4 times and then read "no bus"? Also the check engine and security lights came on. After several more secounds the low fuel light came on.I did at one point remove a plug and there seemed to be no spark. What can I do to get this thing started, short of having it towed. :|