How can I incorporate some sort of Monte Carlo into my model?

Hey guys,

I have a model in which I calculate a fish stock and the revenue a fishery gets from exercising a certain amount of catch effort on this fish stock.

And know I want to make the parameters range (preferably with Monte Carlo simulations) within a certain range.

How can I make these parameters range within my model? It is a very simple and straightforward model

I can post the script if that would be necessary

[the cyclist]

Yes, to get help with your code, it is necessary for you to post your code.