Scenario

how to find the script name of an object

Usually, you need to assign it. ObjectPropretiesTree, the Name field.
Heroes already have a name assigned – but I can’t remember where to find it. I think you select the hero, press Space, and it should be clear from there; there should only be one English name. Something like RedHeavenHero01, Orlando, etc.

And how to set up “collect so much gold”?

If it exists, it would be something like COLLECT_RESOURCES, with parameters for the resource type and quantity. You can find the resource types in Script_IDs, there’s a file like that in the editor guides folder.