There’s more videos about pattern work and sequencing on YouTube. Look for Infinite Flight ATC and you’ll see a playlist. Then, I would recommended watching all the videos once or twice. But to anwser your question, when an aircraft departs from the airport you’re controlling, and they requested to remain in the pattern, you don’t give ANY pattern work instruction. On the other hand, if an aircraft is inbound, you give them pattern work. If there’s more than one aircraft landing at your airport, you sequence. Finally, when the aircraft is on final (for inbound aircraft, that requested to land) you tell them cleared to land. If the aircraft was remaining in the pattern you would say, “Cleared for the option” when they’re on downwind. If you don’t understand most of this you should understand once you watch the videos.