Since yo mention Konsole, I assume you'r using KDE.
For themes and such, look here.
As for help with the command line (konsole), That's a pretty general question.
The general answer would be "to run a program, just type the name of the program at the prompt."
I know that's not exactly what you're looking for.
I would recommend searching for guides on the command line (this site and google are two good places to start).
Here's one to wet your whistle