The only thing I do every time is:
- Ask the coaches, "Are your player's properly equip?"
- Give a sportsmanship talk (required by before NF got involved)
- Mention court or special rules/issues that might apply to this game (this is the only thing I might not ever say)
- Ask my partners if they have anything to add
- Ask for any questions by players
- "Good Luck and have fun."
I will say my sportsmanship talk might change every night based on many factors (e.g. rivalries, familiar teams, respected coaches, conference game, playoffs)
I would suggest that you try to say the same thing until you get used to what you want to say and you hear other officials give their talks. Then once it becomes old hat, you might change it up. I would compare this to a sales talk if you have some background in that area. You say the same thing until you know what important points you want to cover, then it will become totally natural and easier the more you do it.
Peace