When we first introduce schwa, we will change our daily routine slightly. We first focus on reading words with schwa, because it's significantly easier than spelling with schwa. Once your students have had a lot of practice reading words with schwa, they'll be better able to identify where the schwa sound is in a word, which can help with spelling.
Your lesson will start with a quick phonemic awareness activity, what we call a Listening Game. For schwa, you could practice segmenting spoken words into syllables and identifying the vowel sound in each syllable.
In the Warm Up you'll use flash cards that students need extra practice with, such as previously taught vowel sounds and syllable types.
New/Review is where you will introduce schwa and the "Call the Dog" strategy. This strategy can become your listening game for future lessons once students are familiar with it.
You won't have Dictation practice at first for schwa. Instead, you'll want to spend a lot of time reading words with schwa before we ask students to spell them.
The bulk of your lesson will be having students practice Reading with Fluency. You'll start with lots of individual words containing schwa. After they've found success with that, you'll add phrases and sentences.