The first sentence is a run-on sentence: "Roll the chilled dough into small balls and place them on a greased cookie sheet use a floured fork to press them flat and then bake for 10 minutes."
It lacks proper punctuation between independent clauses. It could be corrected by adding a period or a semicolon after "greased cookie sheet," leading to two separate sentences or a properly punctuated compound sentence.
The other sentences are correctly punctuated and structured.