How to prepare macbook to sell it?

My wife wants to sell her macbook, she finds it too heavy and really just uses a phone or table for everything online.

I am PC so pretty darn Mac stupid my wife has the macbook pro i5 13" mid 2012 OSX 10.9.2 ( need more info on it I will get it )

So last night I pulled up instructions on "resetting" it , it involved erasing the drive then re-installing the OS
Which was done by wife being connected to the internet, after a while it erased things and re-installed the OS, ( I am guessing you mac savvy know what I am talking about )

But, when trying to boot to what I call desktop it asks her to enter your itunes password since we wanted a clean like new comp she stopped there, so we never saw it boot up all the way,

My questions,

Is that erase, re-install she did good?

Is there a way to get it to desktop where a would be buyer can see it works? like a "demo" or not locked into a specific person...

Many thanks!
Cheers,
P.

pgiguere1...first thank you! and second i mucked that up,
It's not Itunes holding things up we can skip that it's the screen asking to create computer account name and password,

How do we set up this temp account you say that you do?

Again, thanks!