There's no particular order to read books by Stephen King, as many of his books are stand-alone. His series are encapsulated and typically don't have other books with shared characters.
However, the best way to introduce yourself to his suspenseful fiction books is to start with the earliest titles, as these are the most well-known. You may prefer to wait to read his larger tomes after you've become acquainted with his writing and separated the source material from the movie and TV versions.
His short stories are another option to become familiar with his writing style before diving into the novels.