Shell Scripting problem

Hi guys, I am a newbie to shell scripting.Please help me to accomplish this task. Its very urgent,I should create a script which will do the following:

i) "cd ~joseph/ ; mkdir -p Bing/Bong ;mkdir -p Bing/Bang" and then create 15 ".txt" files with content "Bing Bang Bong" in "Bong" directory with user ownership and read only permission for these .txt files.
ii) and then copy all files except one to "Bang" directory. Also setup immutable bit for file file1.txt in the Bang directory
(ie. By immutable, I mean even root can't delete the files if he choose to.)

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