Other than being a list of all the details you need to pay attention to, wouldn't a simulation ultimately hinge on how well your product or service is received? Are you going to pretend your sales are terrific?

The infamous "beer distribution game" shows how difficult it is to simulate and manage an almost trivial supply chain. I would expect trying to simulate an entire startup would have so many variables that any simulation would only end up predicting real world performance purely by chance.

https://en.wikipedia.org/wiki/Beer_distribution_game