Shell Script Needed (Linux)

I need a shell script (for linux) that does the following:

1) For the directory in which the script is run, it looks for all FOLDERS whose names start with "aaa-" or "aab-"

2) For each matching folder, the script then gets those folders' directory listings.
*Just one level, not recursive.
*Only include folder names, as well as files of type .txt, .doc, .rtf
*Not case sensitive on the file extensions, so also include .TXT, .DOC, .RTF

3) The script then creates a text file that looks like this:

<!-- Begin listing of /aaa-folder1 –>
myfile1.txt
myfile2.doc
/folderX
/folderY
<!-- End listing of /aaa-folder1 –>

<!-- Begin listing of /aaa-folder2 –>
myfileX.DOC
myfileY.RTF
/folderA
/folderB
<!-- End listing of /aaa-folder2 –>

4) The script then inserts the same data from #3 above into an existing file called "myfile.html". In that html file, the script replaces all content between:
<!-- Begin inserted data -->
and
<!-- End inserted data →
... with the same data as #3 above.
*All other content in myfile.html should be left unchanged.

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