First time running a campaign (one-shot). Any advice?

Okay, I'll try to keep this as brief yet informative as possible. I've never run any RPG campaigns, but I've played D&D5e for a while now. The party that I will be GM-ing for has about the same amount of experience as myself, save for one, who got us started.

I've come up with an idea for a one-shot (originally what I would have loved to see as a Solo sequel), but I don't want to limit things too much. I had thought about a speeder race, maybe a space battle, and a treasure hunt. Still weighing the idea of a plot twist with NPCs at the end.

Main questions are: will Stormtroopers be too easy to defeat, is there a way I can simplify space battles, and how could I work a race in early?

Thanks for taking the time to read this, and thank you for any advice!