Ok so what is a wallet? And how will it help me get bitcoins?

http://www.weusecoins.com/getting-started.php
is this a good place?

Im located in the United States i would like the bitcoins within a week but i could wait longer if necessary. I want around 5 bitcoins and no i do not have bitcoin wallet setup anywhere.

Hi im Zach, Im new here and i wanted to find out how to buy bitcoins. I have a bank account. Can somebody please explain to me step by step how i can purchase bitcoins using a bank account?
I really have no idea on how to buy bitcoins so please be detailed.

Thank you

Zach