Here's what I came up with in a quick search of Google:

For music books, this came from this site http://leb.net/ma/FAQ:

Suggested Books of songs:

A_Near_Eastern_Music_Primer_, by Mimi Spencer, third edition September 1994.
Subtitled: "Seven Easy to Medium Pieces for instruments and/or Voices -- with No Quarter Tones".

_Sadika's_Tunes_, by Mimi Spencer, first edition August 1994.
Subtitled: "A Collection of Near Eastern Melodies Transcribed and Arranged by Mimi Spencer". Six tunes without quarter tones and seven with quarter tones.

* Where can I find some arabic MIDI files?

There is a fairly long list of sites with arabic sound files. Please see RMA's webpage for a starting point, at http://leb.net/rma/

This one, http://tamburaweb.com had some fantastic looking links to all kinds for eastern European music some of which had the instruments you mentioned listed. To go directly to the links page, click here

Hope this helps. Good luck!

katlaughing