Go here or here to select one linux. then go to the selected linux's homepage and start downloading the iso (or .img if there is one and you want to isntall it from usb). Then burn the iso and install it from there. dont forget to read the readme before install...

the best distro for me is ubuntu, them debian but the peolpe said it is for GURU's

I like Ubuntu too, it's really simple and gnome is really user friendly

I can recommend OpenSuSE (http://www.opensuse.org) for starters. A Nicely polished linux distribution. Support is also very good.

try this one linux brother..

Damn Small Linux (DSL)

http://damnsmalllinux.org/download.html

you can execute this distribution through live cd..