Welcome to LQ
Take a look at
http://distrowatch.com/
http://www.linux-on-laptops.com/
For a beginner, I would recommend ubuntu
http://www.ubuntu.com/
However, it depends on the specs from your laptop.
Just download the iso from the distribution you want to install, burn the iso to a CD, boot from the CD
Most distro's have a live CD, you can run it from CD, to see if all the hardware is supported.
Kind regards