The best advice I can give you is to spend a good few hours of your life on google.
You don't appear to know anything about Linux, you have to realise that it's not the Windows you are used to and that you will have to LEARN how to use it.
For example, you ask where to get Linux. I was looking at a page yesterday with 148 distributions that have Live CD's / DVD's (
http://www.livecdlist.com/?pick=All&showonly=desktop )
You need to research into which distribution(s) you are going to try.
Wikipedia definition - Distribution - A Linux distribution or GNU/Linux distribution (or a distro) is a Unix-like operating system comprising software components such as the Linux kernel, the GNU toolchain, and assorted free and open source software. Some proprietary software is found in certain distributions and is not free software. A Linux Distribution — or distro, en parlante — is created by individuals, groups and organizations from around the world.