Yep, the Blender interface is daunting when you see it for the first time. At least you got the cube to move which is more than I did when I first opened it. But persevere, because it is well worth it.

As for your mouse problem, you can change the button assignments in the user preferences window if you are more comfortable with selecting using the left button. At the top where you see the File, add, etc hover the pointer over the border between the title bar and window until you see a double headed arrow appear, then drag the window down to open it. There under view and controls you will see an option 'Select with' where you can change the default setting. Save any changes using CTRL+U.

I've not used a trackball but you should be able to assign the buttons  to do as you wish in the trackball software.

Another good resource for tutorials can be found at http://www.cgtutorials.com/c3/Blender/top/1, which has tuts of varying degrees of difficulty. Also visit the forums at www.blenderatistd.org for additional help.

Just shout if you get in trouble.