Hi,
Hi you've reached_______we're not home right now. Please leave a message and we'll get back to you as soon as we can. When leaving your message. Please specify who the message is for, your name, your phone number and what your call is in reference to. Otherwise, your call will not be returned. Thank you.
The part I've put in italics sounds much too peremptory, it's like you are giving me orders followed by a threat. It sounds rude. It sounds like you think I am stupid.
It's better just to say Hi you've reached_______we're not home right now. Please leave a message and we'll get back to you as soon as we can. Thank you.
Best wishes, Clive