Shell script programming help

I'm new to this and I need help with writing a script. The following assignment is as follows...

Create a shell script named Project3-8 located in a directory supported by the File System Hierarchy Standard.
The script needs to perform the following pseudocode in the order shown:
-Display the list of current users sequentially followed by the current directory -Display the list of current users as a background process
-Update the modification time of a file named cactus.dat
-Issue the command to display a message indicating a file named cactus.dat was removed only if the command to remove it succeeds
-Issue the command to display a message indicating a file named cactus.dat was not removed only if the command to temove it fails
-Display a long listing of the /pos420 directory one screen at a time

I'm using PuTTY logged in Linux Server (Excalibur)

Any input on how to get started would help greatly.

Thanks

See #6 here.