Rep Power: 0

So my friend just bough a 1997 honda accord with about 128,000 miles on it. He didn't even test drive it but we wont go there. Anyway so we go there to get the car and while there taking care of some last minute things I listen to a rattling it sounds like the exhaust manifold. Anyway so on the way back to the house I call him and tell him to turn on his lights he says there on but there are no rear lights on only when he turns a turn signal on or apples the brake lights. I checked the fuses and only one was blown and I replaced that but that didn't help the problem. Second problem is that when we stopped for gas we say steam coming from under the hood so we opened it up and it already has brand new radiator and hoses but it seamed that the fluid or pressure was coming out of the reserve tank? So after putting about a half gallon of water in we continued home. I drove this time and when I first started the car the car took a tad longer to start up and when it did start it felt like it was about to just die. "I am still thinking that that is from the battery being disconnected for so long." The final problem was that the srs light is staying on.

So all that being said how to fix these problems?
Yes I am pretty good at cars so I know what I am doing.