Introducing 3-year-old to new baby

Parents who have more than one child (or are currently having the second one), I'm looking for advice or tips for how to introduce my 3-year-old (almost 4) to her new brother who will be born in August. Did you do or do you plan to do anything special when your older children met/will meet their new sibling? Any advice for transitioning into having several children, stopping arguments, preventing jealousy and any other advice or experience is much appreciated!! Thanks so much!!