writers
I model with my own writing most days, and we've grown from one, to two, to 4 or more sentences on the same subject but I have not exposed my first graders to the word "paragraph". Writing works best when its something they are enthused about, so I don't use sentence starters, never have, but we often have a theme; "Bugs", "Pets" etc. They also do very well writing sometimes about a picture from a magazine or calendar. A photo, especially of themselves, works well. We also often write about their art, or a project they created, like their leprechaun trap. I always ask them what they'll be writing about before I had them their journal, just to start their planning process.
Capitals and punctuation are an expectation, but several children need a reminder to check for those conventions before handing it in. I've modelled the question mark, exclamation mark, and quotation marks, but only the top group of writers regularly use these. We've done a lot of lessons on adding descriptive details to their sentences, and they're getting better. We have also practiced writing step by step instructions, reports (following research), letters, and free verse poetry. They often read their writing, at least to a partner, often as possible to the whole class. Sometimes I type their work on computer and display it.