First use: https://morsecode.world/international/translator.html
Then use:  https://cryptii.com/pipes/caesar-cipher (with 25)
Then use:  https://www.browserling.com/tools/text-reverse

Text decoded:
DEAREST READER,

IN MY PUZZLE THERE ARE 12 WORDS TO BE FOUNDT.
THAT IS A TRUTH TO WHICH I AM BOUND.
8 IN PLAIN SIGHT TO BE SKIMMED OVER ARE GIVEN.
5 ARE IN CODE WHICH IS KEEPING THEM HIDDEN.
1 WORD EXISTS IN NUMBERS ALONE.
TO FIND THAT CONSIDER ALL DIGIT THATS KNOWN.
CODES HOLD NUMBERS 1, 12, 11, 10 AND 2.
AS FAR AS 10 TH.
AS FAR AS ORDER GOES, THATS ALL I CAN GIVE YOU.
OF LOVE FROM THE PUZZLER XX