I don't know of any specific examples, but I can give some advice. First you have to decide if the mount is an intelligent monster that participates in the combat on its own, or if its more of an extension of the rider. In the second case, the mount acts on the riders turn and can only take the Dash, Dodge, or Withdraw actions. In the first case, the rider either needs to ready their action to attack on the mount's movement (limiting it to a single attack) or be able to attack at range.
A simple example would be a mounted knight on a warhorse. Using the 60 ft movement and the dash action, the knight could move in, attack with a lance at 10 ft, then move around without triggering any attacks of opportunity (unless a PC is using a polearm). The party then needs to rely on ranged attacks/spells to be able to affect the knight, or use terrain to limit the knight's ability to continue this tactic.
A more complex example would be a wizard mounted on an adult dragon. They would each work on their own initiative, with the wizard dropping spells down on the party while the dragon either uses its breath weapon or engages in melee. Since the dragon would be huge, the wizard would be in the center of the dragon's space, keeping him at 10 ft, and out of most melee range, even when the dragon is in melee.