Before you do anything, I would suggest you at least glance through the manuals for the various components you are going to use.
For the rest:
1. You have included your details for your computer, ty. I missed them when I put this the first time.
2. Windows will prompt you where on your system to install it. Follow the prompts on the screen.
3. You more than likely cannot install drivers until you have your OS installed. Do that first. You will probably find that your drivers on your CD are Windows drivers.
4. You can install drivers from either source once you have your OS installed.
4. A. The advantage of the website source is that you will get the latest versions.
4. B. The advantage of the CD is that you do not have to have access to the Internet to install the drivers.
5. With the greatest of respect, do NOT INSTALL A BIOS UPDATE until you know a lot more about it than you do now.
You may find you cannot access the Internet from the computer without installing some of the drivers anyway.