I have been driving a 1996 Jeep Grand Cherokee for almost a year when I came upon a friend trying to get rid of a 1998 Audi A6. it has been sitting for about 6 months in the grass and has 130,000 miles on it, I got it for $200 since he is a friend and needed to get rid of it since he was moving. I havent been able to test drive it since it doesnt have tags and I need to pay the $300 of tickets on it before I can get tags. I have a few questions about this and I am not good with cars.

1) The front left headlight is out. Is it hard to replace it and does it cost a lot?

2) I noticed there is a sub in the back. The speakers are Bose. Any idea what size it is?

3) There is also a 6-Disk CD changer in the back. I have no clue how to get my stereo to get off of Radio. Any idea?

4) There is plastic peeling off of the hood. Is there any way I can fix this so it looks perfect again.

If I have anymore questions I will ask. If anything was vague please tell me what was so I can try and explain better and thanks for any answeres!