1996 Audi A4 96 Audi A4 2.8 Quattro

I don't really have any questions. I'm just looking for help. I've given as much information as I can. I'm currently not around my car so unfortunately I can not be very specific with noises and such. Any help, advice, websites to get parts from would be greatly appreciated.

1. Sometimes my car won't start. At all. I could have it sit overnight and by the morning it's completely dead. Even with a brand new battery. I don't have any after market stereos or anything. I also make sure everything is off. Even the stereo as well as the interior alarm system lights.

2. When my car does start, there is a squeeling like sound. This only happens when the car is cold. As it warms up, it goes away.

3. My expansion tank suddenly burst and my coolant leaks everywhere. Should I just get a new tank or full radiator system? The radiator seems fine. I've narrowed it down to the hoses since that is where the leak is located.