greetings...

[smk]

One final question...

The salutation goes above the printed message in card, my handwritten message goes below printed message, and closing signature goes on bottom right hand of card. Is this format correct?

[Salutation],

Pre-printed message in card

My handwritten message

[Closing signature].

[smk]

"One of the real joys of the holiday season is the opportunity to say "Thank you!" I am truly very grateful for your support and guidance! I wish you two the very best for the New Year!"

I'd capitalise the first letter of 'Thank'

I also think I'd say '... I wish you both ...' rather than '... I wish you two ...'.

Should there be a comma before "Thank you"?

[5jj]

I'd put the signature on the left or, if the printed message and your handwritten message are centre--aligned, in the middle, under the handwritten message.