I’d plan on making them two days ahead of time (myself) you could store them in a container I either use a metal cookie tin as plastic tends to make cookies chewier or store them on the counter… In 2 days these won’t go stale even if you leave them on baking sheets and gently cover them with light dish towels like flour sack type towels (which is my preferred way to store any baked item so the texture does not change as a bakery would store items. Then place them in a container for travel if needed.

It’s a 12 point star tip, #32 (I think) it’s not a small tip, it’s considered a medium tip. It’s also known as a french tip I believe. Sorry I’m not more specific on the number, but it looks like th #32. I just don’t have them in front of me right nw. I think the ateco 839 is similar, may be larger. Any open star tip will work.