Digital Product is Custom Video - how to that up?

I’m trying to figure out the best setup for this.

I run a sort of advice channel. And I want to be able to let people ask me a custom question, and then I do a video reply with an answer.

It won’t be the same video each time, so I can’t do digital locker. What’s the best way to setup that up for delivery? Is there a setup suggested for this sort of thing, that I’m just not searching the right words?

Thanks for help.