To support writers of all levels, be sure to engage in shared writing experiences on a regular basis. As you and the students decide what to write, you have the opportunity to model the writing process. You can reinforce phonics knowledge, morphology, spacing between words, and conventions such as capitalization and punctuation. You can also talk about word choice including transition words to support the organization of ideas. You can model the habit of reading over what has been written (inviting students to read with you) and make revisions as needed.
Shared writing builds confidence by providing a scaffolded experience. When this instructional practice begins in Kindergarten and continues throughout the grade levels, students feel empowered when putting their own pencil to paper.
With your pen in hand, think aloud. You will likely support more students than you realize!