Custom Joomla 1.5 Component

I've a client(Music Studio) who wants to havea a SIMPLE Multimedia component, and it should be like the following : + Category + Sub Category - Music Item It should be consists of 2 Tables : -Categories : id, parent_id, name, description, no_of_items. - items : id, cat_id, name, singer, album, composer, arranger, writer, sound_engineer, year, production_co, url, download. In the Back-end, he should have the ability to Add/Edit/Delete categories & items(songs). In the Front-end, the users should be able to browse categories, songs . and when the user click on a song, it should open song details page, that has all song details including 2 options, HEAR THE SONG ( using this flash player [login to view URL] ) or Download it. ** The Administrator should be able to upload / add url of the music files. ** The Administrator should be able to select if the file will be downloadable or not. ** Coding should be clear & commented.