We (serious writers) start by tracing. “Look Jane, see spot run.” (An example from a first grade reader of my day.) Thus, your first creative sentence is, “My dog runs.”
As time goes on a writer wants to write their own story, their own way. Great painters start by tracing, they gain confidance and creativity; after much hard work, experimentation, and luck, the world discovers a genius.
Writers will trace those they read, either wittingly or otherwise. We set a standard of what is good. For me, it is Hemingway and Steinbeck; simple declarative sentences.
I’ve developed a writing philosophy; the shortest distance between two words is one word. Proverbs 10:19 states, “In the abundance of words there does not fail to be transgression…”
You write your first piece; “The canine companion, of which there is shared ownership with the rest of my family, ambulates vigorously hither and thither.“ After years of experience; “My dog runs.”