Engraving is calligraphy on stone, so you must have calligraphy skills and a good calligraphy foundation.
But if you are just interested, you can also learn the knife skills first, and then find the calligraphy words in advance for whatever you want to carve, and then use paper to trace them on the stone, and then carve them accordingly. Such works will certainly I can’t say it’s a work of art, but it’s still a very good craft.
If you really want to learn art as an art, then honestly take out a pen and paper and start practicing regular script.