Ask HN: I'm being courted for a technical position at a startup, how to proceed?

Hi HN, I am being asked to be the main technical position at a startup. I do believe the idea is great and has legs, and I have the funds to not starve at this time.

At this moment I don't know if this is a co-founder position or not, so I would definitely be clarifying that. Any suggestions on how to broach the topic?

Aside from my impostor syndrome telling me I'll never be able to do what they are asking, what are some questions I should be asking? What are some things I should look out for?