schedule a monthly ftp event

[willitfw]

Greetings,
I am looking for some guidance on a script.

My goals are:
1) have this script run automatically through a time set schedule.
2) verify if a file is updated on an ftp site (usually on the 15th of
the month).
3) If the updated file exists, ftp it to local drive.
4) e-mail other users when the file has been updated on the local
drive.

I realize this is quite extensive, but any leads or source code will be
appreciated.

Thanks,
Tom W.