1) will this send the message just as it is?
Yes, it will.
2) if I use this, what are the things that I should consider/change/add to this script?
I guess that would depend on what kind of changes or additions do you want to make. (??)
3) I'm in real need of this script but I have no idea how to make use of it
You can simply run it as-is, but you'll want to use different "$From" and "$Recipient" addresses, as well as different text for the message and subject.