さら uses the same reading as the one you learned with the kanji, except it's ざら this time because of the rendaku. 小 uses an alternate kun'yomi reading. You can remember it by thinking "What are small? Kids (子) are small. Bwahaha."
Please set the small plates on the table.
Why don't we just serve foods into small plates by ourselves and eat at our own pace?
It’s impossible to put this huge steak on that tiny dish.