Where to start

[Rocky Ou]

Hey list... I'm going to install Debian sid on my Dell inspiron 2200 laptop to make it a dual-boot machine. Can any of you give me some suggestions regarding to the following issues before I dive into installation process?

1. I have ADSL access at the normal speed of 50kB/S. Do I need to download full set CD? I saw somebody says Just need to download few of them. Which CD should I download? If you could give me a URL for downloading the necessary CDS, I would really appreciate it?
2. Besides back up important info under Windows XP, What are the issues I must address?
3. I want to have a place where both Windows and Debian can have access, How can I do it if it is possible?
4. Right now it seems Unstable (sid) does not have CD image to downlod. Can I use Testing CD to install and change the sources.list after Debian is runing on my machine?

Thanks a lot in advance!