u/Key-Confidence-4679

This may sound really dumb but I need help. I am fairly new to jazz, I just started playing late 2024. I have an improv thing very soon, and I don’t know how to improv!!
I was wondering if anyone can give me huge tips or like even help me figure out what to play! It’s a Bb blues, so really basic, but I’m completely stumped and really nervous.