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You can get help from the musescore community at http://musescore.org/en/forum
Don't forget to mention your version of MuseScore

In MuseScore you can notate the pattern manually or via the plugin.

To install the plugin see http://musescore.org/en/handbook/plugins

If you need help with MuseScore, it's for sure better to...

MuseScore is the right tool for the job and it's pretty easy to use. Check this tutorial http://musescore.org/en/node/11723

On a related note, there are a lot of leadsheets on http://wikifonia.org...

In MuseScore, create a new score (File -> New), choose a flute for example.
Enter note entry by pressing N, Press C. It will put a C on the staff, use the Up and down arrows keys to hear the notes...

You can try MuseScore : http://musescore.org
It's in the ubuntu repository too.

You can get support for MuseScore at http://musescore.org/forum
As far as I know MuseScore on Ubuntu install as well a free soundfont (fluid-soundfont-gm) and you don't have to "manually FIND and...