First, this is the 3

First, this is the 3.8 super charged ssei model. I just replaced the spark plugs, and messed up the firing order. When we started the car I saw the light brighten up and dim before I could kill the car. I fixed the mistake, and it started right up. We drove it 30-40 miles before we noticed the tail lights (daytime running lights) and front running lights were not turning off. We wrote it off to the timer, and let it go. It was night time so manually shut off the head lights just in case, and the next morning it started right up, but the running lights still wouldn't go out. This time when I shut off the car I did not manually shut off the head lamps, and the car went dead. I found the rear light fuse (10 and 13 in the box behind the seat) and pulled it, then tried to jump start the car. The lights were off. The dash wasn't turning on completely, and as my buddy let his car run; the lights started to work one at a time. Then he revved his engine a few times, and I tried to start it. No dash lights whatsoever, the fuel gage and engine temp gage didn't turn on, and no starter engaging. I am thinking I overloaded the electrical system, but I do not know the full extent of the damage to the electrical system. I am certain that I need a new battery now, but what else could have caused the initial drain, and what do you think I blew when I overloaded the electrical system.