It is important to consider your hardware, some distros are lighter than others,
you might want a lightweight distro/install if your hardware is somewhat old(more than 5-6 years).
Don't fry your hardware with more load than it can really handle.
is easy to use and good options for Linux beginners.
is a good choice also very customizable and somewhat easy to use.
There are many others of course it don't hurt to try as many as you want, live cds are a good thing, you can try different distros without installing it.