I recently installed mysql using the following url:

And I simply used the following commands:
sudo apt-get install mysql-server
sudo apt-get install php5-mysql

I used the official mysql tutorials to try to figure out how to start using it, but I simply don't know how to start using it.
I used to following url to get me started.

It gives me the command
mysql -h host -u user -p

My problem is, I have installed mysql on my own Ubuntu computer, but I can't figure out for life of me, what my hostname is. I have tried my user name which is root, and many other combinations.

I know the SQL language, I just need to know how to actually use mysql on my own computer, and how to log into it. Any and all help is appreciated.

Thank You